Quick Transistor question?

I am using pnp transistors as switches. I finally got a working prototype!!!Anyway my prototype motor runs at .18A and the real motors I want to run are 3.3ACan these PNP's handle that?http://www.radioshack.com/product/index.jsp?productId=2062585And can you tell me how to figure that out so I'm not always asking simple questions?Thanks!

Posted by kendallickes 9 years ago


Transistor as switch with low leakage current

I don't really know much about transistors, alas, but I am looking to use a transistor as a switch in a device where it's important to me to that the batteries (3xAAA) last about a year. This means that I want to minimize leakage current. I would like to use about 20 mA at 2.7V to control 0.5-1 A at 3.3V (I have 4.5V at my disposal, so I can handle a 1.2V drop through the transistor). The device is a water leak alarm which I assume uses almost no current except when it's alarming. Any suggestions on what to use?  A lot of people use TIP120s as switches, but I've also seen comments that indicate that they have an unpleasantly large leakage current. And I don't need the high voltage/current/amplification capabilities of the TIP120. Or should I just use a solid state or electromechanical relay?

Posted by arpruss 3 years ago


latch with timed variable reset using transistors

I made a 555 t flip flop and it works nice (i use it as a light switch in my room), but i would like to add another button, whet i pres it would turn the light on  for a time and then automatically off after some seconds to minute. can anyone help me?

Posted by bugijs123 7 years ago


identifying transistors

Hello all, i have a lot of transistors that are mixed up. how can i ID them? example: on the front markings are .BC 7-25 014. and on the back is the letter Q what transistor is this?

Posted by sasarchiver 6 years ago


Transistor switching problem

I am having trouble using transistors to switch a some LEDs, I have 5 LEDs in parallel being switched by one transistor but each LED is indervidually switched by another transistor. I have given each LED its own resistor and the problem I am having is that when all LEDs are on each LED gets dimmer then if only one was on. I don't really understand why this is happening but I'm not 100% comfortable with transistors and I have probably done something stupid. I have attached a image of how I have wired it up with only two LEDs

Posted by camlv 8 years ago


What does mpsa transistor mean?

I have a project that requires mpsa13 transistor but the local electronics shop only carries mpsa12 i don't know what is the difference between the two, what are some alternatives or do they have different names in different country. thanks in advance

Posted by MaxF5 3 years ago


Transistor Trouble

Hi there, I have been working on controlling a large toy car with a wireless receiver from a smaller toy car, the motors I need to control are rated for 9V but the receiver only outputs 3V, reversing polarity to reverse the motor. I made this schematic using transistors to handle the voltage, but when I built the circuit the transistors began to heat up and there was no output. I am not sure why this is happening, so any help would be greatly appreciated. Thanks, Daniel

Posted by daniel12354 2 years ago


Tip31 Transistor alternatives

I teach middle school science, and I'm helping a small group of keen students work on DIY projects.  One of the students wants to try this: https://www.instructables.com/id/Music-LED-Light-Box/ It calls for a Tip31 Transistor, which is proving difficult to find, at least in Canada.  The comments section suggests at one point that any NPN transistor will do. Can anyone confirm this?  Or can you suggest more readily available alternatives? Thanks!

Posted by dochockin 2 years ago


Electronic Circuit

I have a spst relay(operating voltage-12v) using for switching the solenoid valve(24VDC and 0.5Amp) which connected through 24 V battery. relay is again connected to the transistor BJT NPN . So please suggest me that which transistor is most suitable.

Posted by jay_3189 5 years ago


Transistor help

I got a 5M LED Light Strip. Its controller say it needs 12V 2A but each LED uses 20mA each and there are 300 in this strip which = 6A. I want to cut this strip into 4 segments and power each one using an arduino. 1 strip = 2.1A 2 strip = 1.26A 3 strip = 1.5A 4 strip = 1.14A =6A My question is do I need different transistors for each strip because of the difference in amperage or can I use the same one? If so, which one!? Thanks for your attentions. Bobbay

Posted by Tzla 6 years ago


Wondering What Kind of aTransistor I Need

I'm looking for a transistor that can control 12V from arduino which I believe is a 5V signal? If I'm wrong, I need what it gives off but I'm looking for one to control motors that are 12V. Thanks!

Posted by MackeFeet 5 years ago


12v to 6v voltage regulator at about 15 amps

Hi, i have a 1963 VW bug that is very stock, but the 6v lights just dont work very well (dim at idle, then not too bright at speed) it is very simple to use a later 12v generator and then swap out all the lights, battery, coil and relays and it works great. BUT i have a 6v wiper motor and also a 6v gasoline heater that i will need to keep at 6v (the 12v parts are just not available or too expensive) I have found an article that recommends building a cheap voltage regulator using a 7806, ( 6 volt, 1 amp regulator) and 2 1uF 35v tantalum capacitors, then a NPN transistor which the original poster says is a 2N5881 npn transistor. here is the scematic. the pdf article is attached and the link to the original article is here http://www.studebaker-info.org/tech/6-12V/6-12-6.html  The questions i have 1. what is a 2n5881 been replaced as? i cannot find it at jameco and the original posted doesn't give any specs for it. 2. how would i "pump up" the amps available from 10 to anything else (looking for about 15 amps) thinking that the npn transistor is the key but i am new to this and wouldn't even begin to know where to look. 3. what happens if any item fails? can i put some sort of safety into this so it quits rather than passing any addition voltage through additional info the heater runs at about 85 watts so 85 watts / 6volts = 14.616 amps  the wipers run at much less than that so building 2 of this would work great.  Any ideas? Thanks in advance for any insight to this 

Posted by starvin 6 years ago


Stupidly simple circuit question - answered.

OK, so I accidentally volunteered to make an X-factor type buzzer board for a school event. Three switches.  Throw each switch, in any order, a light comes on. Throw the third switch, in any order, and a buzzer and/or fourth light comes on. It's a simple circuit.  Must be.  Just a few transistors, LEDs and batteries. But, I just cannot work it out! I should be able to sketch it out in my sleep, but my brain will simply not cooperate. I'd prefer to use a single DC power supply, up to 12V (multiple LEDs to make the lights brighter), but I have several I can use if required. Dimensions are not important, I'll just change the lengths of wires. But, can you help with the circuit? >K< Thank you, Lemonie!

Posted by Kiteman 8 years ago


High Voltage Amplifier

I am trying to build a high voltage amplifier that will amplify an AC signal of approx. +-5V to a signal of approx +-100V.  I was looking into building a common-source amp using JFETs or a common-emitter amp using BJTs, but both seem to have an output waveform of 0V to +100V.  Is there a way to modify these amps to have an output waveform of -100V to +100V?   Also, if anyone has any better Ideas, please let me know. Mark

Posted by questionmark05 8 years ago


What kind of switching circuit do I use with Arduino

I have a 3V battery pack connecting to a single circuit.  I want to replicate this circuit 10+ times using the same battery pack as a source.  I need to apply some sort of 'switch' to control the follow of current amongst the circuits, hence turn on/off various circuits as needed.  For instance, I have 10+ servo motor circuits.  I want to connect the single battery to each circuit and control which circuit gets the current from the battery.  I have an arduino but I don't know how to interface it with what I am trying to achieve.  Any suggestions?

Posted by sheonbanks 4 years ago


AC187 Transistor Alternative???

Hi I was wondering if anyone knew of any Silicon or Germanium alternatives to the AC187 Transistor. Also is the BC548 or BC547 Silicon Transistor an alternative to the AC187 Germanium transistor?  Thanks in advance

Posted by Ikram1ali 3 years ago


SS8550 D331 Transistor

Hi , Guys can you tell me if  2N2222 Transistor is equal ant to SS8550 . It's in an IR circuit . Thanks in advance :D

Posted by UsmanK14 2 years ago


Transistor relay with NO and NC?

Does anyone know how to make a solid state relay with a NO contact and a NC?Does anyone have a schematic?Thanks.

Posted by thermoelectric 9 years ago


overheating transistor on DC motor control circuit

I am trying to control a DC motor using 4 transistors, i am using 547 transistors connected to a motor with two on each axis, the opposite corners are wired together with two pushbuttons, the transistors change the polarity of the motor so that if one button i pressed the motor spins one way, the other button vice versa, but the motor is running very slowly in this setup and the last two transistor that go from the motor to ground heat up very quickly. the circuit works fine with only one transistor but i want to be able to change the direction of spin, does anyone know why the transistors are acting like this or a better circuit to control a DC motor? thanks very much!

Posted by sholtob 6 years ago


TIP31cg transistor

HI all, im trying to make this project, a led box that flashes to music https://www.instructables.com/id/Music-LED-Light-Box/ i purchased a tip31 transistor, but when i got home i discovered it was a top31cg. is this going to be a problem? thanks all!

Posted by i-like-cheese 8 years ago


Transistor question

Hey guys I have a question on transistors. When using for PWM setups, is the difference between each NPN (or PNP) transistor model by its specs? Such as gate voltage, max current, etc. I am making a LED touch setup made by qs, but I want to make it so that the Arduino activates a transistor to turn on a string of lights that the arduino could not power on its own. Here is the setup of the LED string. I want to replace the TIP31 in the wiring diagram with a NPN transistor (like this one). By replacing it, which pins go to which wire and do it have to add anything else to the setup? Will the new setup also work with PWM signals? Thanks! KT Gadget

Posted by KT Gadget 8 years ago


Need Electronics help

Anyone know a simple circuit that will let me test to see if my transistor is burned out?

Posted by Shadowmang 9 years ago


Where can I get a MPF Transistor?

Hey guys, I wish my local store had more stuff but it is kind of bad... Does anyone know where I can find or get a MPF, I bought a NPN transistor instead do you guys think it will work? I am making a sound amplifier, are there and equivalents if I don't find the MPF? Thanks, Tobias

Posted by TobaTobias 6 years ago


One Transistor Based Code Lock

Hello All, i have tried really hard to search for a Instructable based on the above topic, i do remember that i saw it in this site but now i cannot find it, the circuit is http://www.circuitstoday.com/one-transistor-code-lock, please link me to this Instructable, i would be really thankful to all of you. ALSO HOW CAN I ADD A BUZZER WHEN A WRONG CODE OR COMBINATION IS ENTERED.  ALSO WHAT TYPE OF SWITCH OR PUSH BUTTON SHOULD I USE PLEASE GUIDE ME.

Posted by khan12 5 years ago


How to select transistor?

Hi guys! How do you know which version of transistor to select when it comes to doing some projects? I mean, lets say i have all the parameters of my project, the output current and voltage, so how do you know which specific model of transistor to select from the data you have? Is there some kind of list from which we can select the required model from our data? For example, i have an LED array which draws about 90mA of current in total and has a total operating voltage of 15V, and from past instructables that i read on this site, i know that BC547 has a current rating of 100mA and can tolerate the voltages, so i can use it. My question is, that suppose i didn't read these instructables, then how will i know which transistor or FET i have to select that has a current rating of about 100mA and can tolerate the voltages(i.e how will i know that i can select the BC547 or alternative)? Also, when selecting a diode for example, i know from reading few instructables that 1n4007 has a rating of about 1A and can tolerate good amount of voltages. Suppose i don't know about the diode, then how will i know that based on my requirements, i can select the 1n4007 diode? This is an example in general, and it applies to all cases of load currents and voltages, and other semiconductor devices.

Posted by charmquark 5 years ago


Triggering a flash circuit with a voltage pulse across a transistor

Hi All,        question from a newbie. I'm working on a project for my (steampunk) daughter. For part of it I've taken the flash circuit from a disposable camera (PDF 1:Flash+MechanicalTrigger). This works just fine when I close the trigger mechanically. What I want to do is trigger it with the same pulse (from a 555 timer) that I'll be using to do other things at the same time. To this end I added a transistor as shown in PDF 2:Flash with transistorTrigger. My intention is to feed the 555 pulse to base, saturating it and triggering the flash. Result, abject failure. Help! The proposed triggering transistor is an MJE340(NPN). When set up as shown the indicator LED glows but voltage across Emitter-Base produces no result. When testing I noticed that if I mechanically make the collector-transformer connection it triggers a flash, even with no voltage across emitter-base. I'm stumped. Any ideas very gratefully accepted. Thanks, Fred.

Posted by fredstein 6 years ago


Implementing astable multivibrator using transistors

Hi guys! So i wanted to construct a basic astable multivibrator using two transistors, so that i can demonstrate a friend its working. The basic circuit according to me is something similar to the file i attached. So can it be implemented practically without any problems or any modifications are required? I will mostly be using a 220-12 v transformer along with a rectifier and a filtering capacitor as the power source. My load will mostly be a few LED's. Although i wanted to show him using 555, i think it would be better if i show him the basic circuit first. I will show him the 555 version later. (Although i ran out of components this week including 555, and i can only get them next month :P)

Posted by charmquark 5 years ago


help with a transistor circuit that acts like a latching relay

Hello all,, I just joined and this is my first post even though I have lurked here for some time. Now my question. I am trying to build a circuit that behaves like a latching relay. I can build a latching relay from ordinary spdt relays, however im working on a project that is going to require several of them and size is an issue. Im pretty sure a few transistors will do what I want and im sure I could figure it out on my own. I just figured I would ask here to see what kind of answers I get. I don't want any arduio stuff or microcontrollers.. My goal is to keep it as simple as possible and completely solid state and electromechanical.. basically I need it to be triggered by a negative pulse and stay on until a different negative pulse is sent to turn it off.. If possible I want to work into the circuit an adjustable output, either - or + so I can just set it to suite my purpose. It wont need to handle much current, I can add relays to the circuit to handle the higher current stuff.. I have basic to moderate experience and knowledge with electronics so I can understand some terms, but please keep it worded as plain as possible.   Thank You...

Posted by aclark32 5 years ago


Help selecting a MOSFET, please

Guyfrom7up sent me this schematic for an ignition coil driver. I'm trying to determine if the MOSFET, IRFP450, could be substituted with any of the MOSFETs from Electronics Goldmine. The search doesn't create a link, search "mosfet" to get the list.I know I could get it from somewhere else, but EGM has parts for a few other projects, and I like to combine shipping.

Posted by CameronSS 9 years ago


transistors

Finally got around to learning about transistors and this is by far the best transistor site I came around. Feel free to add all you know about how to use different types of transistorshttp://www.allaboutcircuits.com/vol_3/index.htmlsearch around the site

Posted by guyfrom7up 10 years ago


Do they make PNP Transistors that can handle 3.3A

Do they make PNP Transistors that can handle 3.3A

Posted by kendallickes 9 years ago


DC buzzer/noisemaker that doesn’t use a transistor?

I’ve got some nice homemade field phones I made out of old carbon microphone handsets.  I’ve currently got DC piezo buzzers for ringers (which have transistors in them). I want to them to be able to survive an EMP, so I don’t want to use transistors. Is there anything I can use for a DC buzzer/noisemaker that doesn’t need AC power, or a transistor?   The voltage of the phones is 1.5v - 3v dc    

Posted by instrucables360 2 years ago


How to use a transistor with many LEDs

Hey! I was wondering I want to 1 pin on my ATtiny2313 to turn on 10 LEDs at once, but I know that I should have that many LEDs hooked up to the same pin. Can I use a simple transistor (3904, 2N222A) as a switch? Sorry I am very ignorant about transistors and capacitors :D

Posted by HavocRC 4 years ago


why use a transistor when i can use the I/O pins of an ardunio

I keep seeing explanations of the uses of transistors for electronic projects. but i dont understand why i would for example: use a npn as a switch for an LED when i could just program my ardunio to use to turn it on and off again? or use any micro controller for that matter. thankyou in advance for your help im still new to eltronics

Posted by JoshuaH171 1 year ago


Transistor Voltage Inverter

I am a newbie and was hoping someone could assist me. Given the following schematic which takes a voltage of 12v and considers it off and a voltage of 2 volts and considers it on can someone tell me what changes would need to take place regarding capacitors and resistors (if any) to account for 20v instead of 12v? Meaning that when 20v is considered off and 2v is considered on.

Posted by TimothyE2 3 years ago


Help with wiring TIP31 transistor to run LED's on subwoofer?

I am wiring LEDs to my subwoofer to sync in beat of the music, to stop the bulbs from blowing, i am thinking of wiring a TIP31 transistor to it and plug in RCA and 12v in to run it using a rca out to the actual amp, in the attached picture please make sure i got all the wiring right and tell me if it would work http://i1245.photobucket.com/albums/gg589/daleumad/asdfghnh.png id get a bigger picture but it wouldnt let me, just use like browser zoom or open in paint

Posted by daleumad 6 years ago


how to convert negative pulse to positive

Hello.. I built a transistor scr to turn on leds in my car from my remote.. my remote uses negative pulses to turn on and off... now the problem is that the scr needs a positive pulse to turn on but it uses negative to turn off,, so turning it off isn't a problem.. Im pretty sure I can just use a transistor to do this.. here is the schematic I used to build the scr...http://www.talkingelectronics.com/projects/TheTransistorAmplifier/TheTransistorAmplifier-P2.html#Latch  ... fig 75b... is there a way to modify this circuit to make the turn-on negative or just a way to use another transistor to make my negative pulse positive? I could easily use an automotive relay to do this but im trying to make this as small as possible and its still on the breadboard.. I want to get this figured out before I put it on pcb.. thanks for your help

Posted by aclark32 5 years ago


n channel jfet

Can someone show me how to hook up an n-channel jfet transistor? My power supply is +5volts. Where do I hook up the load. I know the gate has to be negative relitive to the source( the source and the drain can be used interchangably, right), but I only have a positive power supply. I want to use an n-channel jfet because it normall conduct, right?I found this website:http://www.allaboutcircuits.com/vol_3/chpt_5/1.htmlbut I don't get it entireleyI am thiisss close to understanding how to use transistors!

Posted by guyfrom7up 10 years ago


Transistor help.... very basic, LDR/LED

I'm trying to make a very simple circuit to light an LED based on light from an LDR. I have all the components, it's a white LED, I'm using two AA batteries, and the LED glows brightly when I attach it to the batteries, but when I attach it to the LDR, it is either dim or dimmer due to the resistance... I'm sure I need to use a resistor for this... I have some assorted PNPs and NPN2222As... I've looked at a couple tutorials, but none of them seem to work... does anyone know how to do this without any (or as few as possible) other components? Thanks

Posted by perkinsb1024 10 years ago


Complementary transistors

What or which PNP Complementary transistor can I use with a N-Channel  IGBT HGTP10N120BN 35A 1200V NPT   Transistor  ? I really will thank you . I'm building an H- Bridge motor drive. Ed.

Posted by DELETED_applegoose 6 years ago


Is it possible to make a specialized spark gap device that operates similarly to a transitor?

I have a serious issue with utilizing an H-bridge to switch polarity of high voltage electromagnets. The voltage is roughly 110 DC rectified from mains. Every mosfet I use has exploded when I tried to switch the mosfets. I tried using relays but they keep arcing and tripping my breaker. I would very much like to know if it was possible to make a spark gap that works similar to a NPN transistor.

Posted by 50ul84n3 7 years ago


Where do i get photodarlington transistors or equivilent?

Where do i get photodarlington transistors or equivilent? anyone know? to be clear it basically looks like a black led with a + and - unlike most transistors that have 3 prongs this only has two. when light hits it, it allows current to flow.

Posted by kendallickes 9 years ago


help picking transistor

Me no get no transistors. me need help. me using ltc4060 chip and me need help picking the pnp transistor. heres datasheethttp://www.linear.com/pc/downloadDocument.do?navId=H0,C1,C1003,C1037,C1078,C1088,P7601,D5235it's on page 14 - 15I'm using 3 cells and a charge current of 35 mABTW I'm not stupid, just never really got how to use transistors

Posted by guyfrom7up 11 years ago


What is a transistor ?

What is a transistor (( can it transform voltage for example from 5v to 12v ?? )) Which component can transform low voltage to a little higher voltage ?? Thanks !!

Posted by yousouf 6 years ago


help w/ transistors

Does anyone know a good experiment to teach what transistors do? I have read everything I can find about them and I still don’t understand what they do and how they do it. Can anyone help?

Posted by kendallickes 9 years ago


audio amplifier

HI, i have a bunch of transistors that i took out of an old cd stereo. I was wondering if anyone could help me figure out how to make an audio amp using one or two of them. I am really new to electronics and I haven't had much luck figuring it out on my own. The transistors I have are like little rectangles with a hole on top the kind that usually has a heat sink. some of the numbers on them are: B1344, B1342, k3053, D2012, i also have alot of capacitors ranging from .47 to 3300uf  these are 50 v and 30 v. I've tried other audio amp plans but im having trouble learning to read the schematics. Any help is appreciated ill make an instructable if i can figure it out.

Posted by tehaceofspades 7 years ago


Arduino Input

I am writing an Arduino program to read speaker inputs for a test station.  I need only to know when a speaker lead is on or off. This will be done by using the fade and balance.  Originally I was connecting the speaker leads to the analog inputs and could get a single line to work as a simple VU meter. Multiple lines gave issue.  Since I don't need to know the actual level, just whether they are on or off I'd like the speaker lead to trigger a transistor connected to a digital I/O pin on the Arduino.  Any thoughts or quick schematics on how to do this? 

Posted by dbirky 4 years ago


Odd problem with EL Wire... Help?

I’ve been working on this circuit and I can’t quite get it to work right. I wrote out all of my diagnosis in detail, so it’s a bit of a text wall, but perhaps you can just look at the drawings and skim the “odd part” and know what I’m doing wrong. Thanks so much to anybody who can help me out with this. Description: It uses a remote controlled LED controller to turn some EL Wire either on, off, or flashing to music. There is also an override button, to use in case the LED controller stops working. The LED controller requires 12v and outputs the same voltage. I put the diodes in to protect the controller from the 12v that would come across the override button if it was on and the controller output was off. The transistor is a TIP31. The wires going to the override button and to the EL wire are both detachable (using a molex connector). Diagnosis: The override button turns the wire on just fine, but the LED controller does not. When I did a quick test before assembling things by attaching only the controller to the power source and the wire to only the controller, it worked just fine. Additionally, when the override/EL molex is disconnected, I am able to get a +12v reading from my multimeter coming out of the LED controller. When it is connected, however, I am not. The LED controller outputs no voltage, and when I switch the output on, there is often but not always a small blip of voltage. Here’s the odd part: If I turn the controller output on while the override button is on, it DOES output 12v. I can then turn the override button off, and the wire remains lit, the controller continues to output 12v. As soon as I turn the controller off, it will refuse to turn on properly again until the override button is activated (even though I detect 12v going into it). I tried replacing the diode on output 1 with a transistor (generic npn, a BC337 if I remember correctly), and adding an LED between the output and ground. Neither fixed the problem, but I think that I will keep them because the transistor does not have a 1v drop like the diode does, and the LED is an easy way for me to tell whether or not the controller is outputting. One thing I did notice is that the LED did light dimly when the override button was on yet the controller was off.

Posted by theqwertman 7 years ago


Control bulb with inductive proximity sensor

Please see attached diagrams in my other message below. I am using an NPN NC inductive proximity sensor (specs attached) to control a light bulb. The bulb is normally on and goes off when metal is detected. It is a 12v/21w bulb, powered by 12VDC. I have placed a heat sinked TIP120 NPN High Power Darlington Transistor 60V 5A TO-220 , a 2.2K 0.25W resistor and a 560R 0.25W resistor as shown in the circuit diagram on the right. Please ignore the left diagram for the LED. voltage readings for sensor with no metal detected: Between brown and black: 12.06/07V & -12.03/04V. Between blue and black: 0.0033V & -0.0032V (3.3mV & -3.2mV)  with metal detected: brown/black: -0.6/7mV & 0.7mV  Blue/Black: 11.96/97V & -11.93V Although the sensor is powered and detects metal ok, the bulb stays on. The polarity of tIP120 is correct and gives out heat ok. I can't figure out what I'm doing wrong so could you please see an obvious error?? thank you

Posted by nathanimate 3 years ago


Throwies reimagined - Really I did tried :) :| :/

Seeing other forms of making interactive throwies, eg using microchips impresses me.However i think it is important that we try parts of the B.E.A.M philosophyhttp://en.wikipedia.org/wiki/BEAM_roboticsNamely keeping things simple, and avoiding the use of microprocessor.The component of a interactive throwie is that it has1. Power storage2. Trigger3. Circuit4. LED5. (optional) Power collection of radiant energy.I like to see more suggestion on ways we can address each issues.But to kick start the issue, can you see if my idea is feasible.essentially for my prototype not-yet throwie, I used a circuit from http://unconventional-airsoft.com/2003/11/16/momentary-fan-switch/#more-21to create a throwie that on sensing motion, doesn't flicker but turns on for a while.By ensuring that i use few and simple componants, i hope to keep cost per throwing down.Unfortunately my problem is that using a resistor to keep the capacitor from draining too fast from the base, actually decreases the voltage drop to an unacceptable level at the led.On my end it is unsolvable for the moment. Maybe you can work out how to make a cheap throwie, that can still do these functions or more.Any ideas how to solve this?Other Ideas for throwies1.Open and attach a switch to a barometer, to have a air presser passive trigger.2. A leave shaped pad with two conductors that do not touch, to act as rain sensors. (Resistance increase when leaf dries)3. Is sensitive to infrared radiation from side, so that the throwie is trigger-able by other activated throwies. (As well infrared devices)4. Has a short loop of coil to recharged capacitors, by outside induction.5. If activated rarely, uses a tiny single solar cell to charge capacitor.6. Has a hook to be easily collected for recycling. (Using a simple loop of wire on a pole [Like a dog catcher pole] )7. A single thermistors in series with led.8. A tricolour LED, and a Two light resistor. One LDR acts to sense if it is day an night, if night a low power light is activated. Only when an object strays near, and reflect light into another LDR, does the throwie get triggered at all.9. A throwie triggered by vibration.10. A throwie that responds to radio waves.

Posted by akimbo m 10 years ago