Is my shematics good ?

Hi there ! I have the project to make a trash compactor. To do this i have a truck wiper motor ( 180W 24V 30A ) and a worm screw sytem. To control this motor, i've made a H bridge with this transistors To control the intensity consumed by the motor and prevent it from burning, i use a current sensing chip http:// To control all of that, i use ATTiny 84. My power suplly is 24V 30A and my µC ( The ATTiny 84 ) use 5v suply so i have to convert a part of the 24V to 5V. To do that i use 7805 but i think it will burn or i will lose lot of energy. I've made the shematics of my circuit and i wonder if it's good or not and what can i change. PS: The two switch in the schematics are end positio sensor. Thank :D and sorry for my bad english :/

Question by retrobotic 5 years ago  |  last reply 5 years ago

Is there any simple circuit to lower dc voltage?

(which is about 50v) by at least 20 volts(so it reached the thirties or twenties in voltage) And NO it NOT the phone line Keep it as simple as possible

Question by ReCreate 10 years ago  |  last reply 2 years ago

Can somebody show me a circuit to charge a 16volt 10,000uf Capacitor bank in a relatively short time?

Hi, i have a bank of 16V 10,000uf capacitors that im using to make a battery tab welder.  The problem i have is charging them.  Can somebody show a capacitor charger circuit that can charge these caps in a reletively short time....  60 seconds at the most.  I tried using a camera circuit but the thing to 30 minutes and 37 seconds to charge the capacitors...... i counted....  please help me.  Thank-You.

Question by silencekilla 8 years ago  |  last reply 8 years ago

is this transformer

I have this transformer i think. i want to build coilgun and only thing i found is this transformer. does somebody know how  i could connect this with 2x aa batteries and  make  capacitor charger??? ( if you have shematics that would be great) 

Question by tealk 5 years ago  |  last reply 5 years ago

how to turn led on and off in asm

In asm how do i turn this led on and off i inted ti build a 5x7 led dot matrix but first need help with the programming in asm to turn and led on and off rest i will work on from there if anyone can help the pic below is the shematic

Topic by john criten 10 years ago  |  last reply 10 years ago

Needing Schematic for a High Amp Power Regulator

I have two transformers ( 430-7101A) that're wired together from a APC Battery Back-up that I'd like to turn into a high amp regulated power supply. I've been looking through the site and have seen very few options. I'm positave that (sorry for the pun) there's a shematic somewhere out there and would Love to get my hands on it. These are a very nice pair of transformers that I'd Hate to see go to waste. And help would be Great! TIA

Topic by your_dragon113 6 years ago  |  last reply 6 years ago

Audio signal help? Answered

I was going to build Amplifier with Gain = 20 Minimum Parts From this datasheet But I have no Idea how to put the signal on. I think that the signal is Vin (pin 3)  but that is one cable when a headphone has three cables. I know the red wire is right and the blue is left and the other is comm so I onley need 2. Because there is one input I need to make it one cable. Would this work (I will test what resistor I need with a voltmeter later). If I am wrong about there olny being one input can someone explane to me how to wire it.

Question by David97 7 years ago  |  last reply 7 years ago


After reading this, and then this, I started thinking of how easy it would be to make a burning laser. I went to Radioshack, got some components, and started thinking. One thing that Stephanie's laser didn't have is a potentiometer, to control the power of the laser. Well, I ended up getting 12 assorted pots at Radioshack, but didn't know what one to use. I want decent control, too. What size (in ohms or k-ohms) do you think I need? I'm spotty in my electronics knowledge. PS- The size in ohms on the pot is the pot's range, right? If it says 100k, it means that it will resist from 0 to 100 kilo ohms, right?Also, in the shematic below, I don't know if the pot is connected correctly, post a comment if it's wrong.

Topic by John Smith 11 years ago  |  last reply 3 years ago

Capacitor charging circuit using bd243c. Will it work?? Answered

I recently made a schematic to charge a capacitor bank for my coilgun.D1-D4 are all 1n0007 t1 is a centre tapped transformer which will step up 12v to 330V. WIll it work. r1 and r2 are 10w resistors. Q1 and Q2 are BD243C with a rating of 65 watts.  i found my transformer from a very old cassette player. huge and heavy able to pump about 100W. i don't bother about charging time. I just want to know if it would be good. don't worry about the voltage monitoring i have a small voltmeter(like a watch. chinese product.) i am just want to know if it will work or not UPDATE: I have tried the shematic. It works flawlessly.  

Question by ARJOON 8 years ago  |  last reply 8 years ago

Need help with wiring a KJD17 switch for homemade stick welder!

Hello everybody! So, I finally got around and made a stick welder, and it wa surprisingly easy! Now it's just up to make the box it will live in, cooling and on-off-switches and the like. I have a KJD17-switch which I'd really would like to use, it has automatic safety protection against power outages and restarts, which sounds nice enough, considering that this again is an electric appliane that I made myself, meaning more protection is always good! Now the problem is the safety protection, as I do not know how to wire it! Where am I supposed to connect the A1-pin? To pin 14, maybe? I'm afraid I'll destroy this nice switch by connecting it wrong, so if anyone has a clue, please let me know. The datasheet for the switch can be found here. On the datasheet there is the same shematics as on my switch. Best regards Elmo

Topic by Kaljakaaleppi 7 years ago  |  last reply 7 years ago

How do I publish an Instructable and can make sure my work is not stolen for commercial products? Answered

Background: A nice member noticed an induction heater "kit" on Ebay and commented about it. After a lot of digging I found some pictures and technical details on the web - Google translate might be funny at times but was a real help for my bad chinese skills... Turned out the shematics for this heater are identical to my design. Sure they use a different mosfets and and create a nice looking circuit board for all but it does not change the fact that my design drives it. One chinese wholeseller is selling them in 500pcs bulk. Current problem: I am working on the next generation of my induction heater based on an induction cooktop. Since the power levels are much higher and more option possible I think it will be a great project loved by a lot of people. But I feel reluctant to publish it in a detailed form that can be used by everyone to re-create it as I fear it will end up on Ebay as well. So far I can't even estimate how much profit some chinese guy is making while laughing at me and for obvious reasons I would like to prevent that from happening to 2.0 as well... Is there any way to protect my designs or to get hands on the chinaman to strangle some money back out of him?

Question by Downunder35m 2 years ago  |  last reply 2 years ago

SST plasma tube

I am in the process of creating a plasma tube, similar to those globes but made from an acrylic tube of about 80cm lenght. In my small scale experimets with a glass bottle instead of the tube I was able to find a way to mix some Argon gas into the vacuum to create the type of plama arc I want. Problem is the HV part for the much longer tube and how to keep the input voltage at 12v to be electrically save. To drive the switching part of the HV section a simple quare wave generator with adjustable frequency and pulse width is used. In my current design I use 5V for the driver and 12V for a TIP122 that drives a modified flyback transformer directly. Now to specify my problem: The TIP is good for 100V and up to 5A with proper cooling. But I would need to make a new HV coil capable of delivering around 80kV at 12-30kHz - that is the easy but time consuming part. The primary side would have quite some inductance and I fear the TIP122 would soon get into trouble. So I was thinking of using a IRF260 mosfet instead but they need a proper gate driver for high and accurate switching speeds. To further seperate the driver from the hot action I thought of using a LED on the driver side connected by a fibre optics cable to the Mosfet driver. Would it be feasable to use good a transistor to drive the gate of the Mosfet directly or is a gate transformer the better option? Are there any shematics available for a gate driver that uses an optical input? And yes, of course I will make an Instructable if I ever get it all working to my satisfaction.

Topic by Downunder35m 4 years ago

PICAXE Ciruit Help needed! I'm trying to figure out why my circiut is not working. Can anyone help? Answered

Note: I have attached a copy of my programming and the schematic of the circuit. As part of my school systems engineering course, I have decided to build an automated chook shed door. For the electronic side of this project i'm using a PICAXE microprocessor (PICAXE 08M - to be exact) to control the up and down operation of the door - which is done using a 12 volt linear actuator, all powered by a 12 volt battery (eventually to be rechagred by a solar panel). My theory is to basically read in the light level using an LDR and then based on this level to open the door, or close it. The is designed to work through the use of 3 relays (all with built in diode protection). The first relay is connected to the 12 volt power which supllies power to the other set of relays, and in effect the actuator, when ouput 0 is turned to high (I'm using transistors to do this as seen on the in the shematic). When I want to reverse the the motor I again turn ouput 0 to high, but also ouput 1 to high which switches the the other coupled relays (again using a tranistor) and in effect the polarities of the actuator.I'm also using two microswitchs on the bottom of the vertical sliding door as a safety mechanism, so that when the door is closing and an obstuction occurs (i.e a hand or piece of wood), its programmed to lift the door for about a second before trying to close again.  As mentioned before it acts a safety mechanism so that no little fingers can be chopped off, and the actuator it self doesn't overload and blow up (although I'm pretty sure it has inbuilt protection for this anyway). Ok anyway to the problem, I have wired everything up as to the schematic I have provided, and loaded the program onto the chip (which it does successfully do) - however its not performing as desired. I have placed the same program onto another identical PICAXE system (except it is not obviously connected to all of the stuff mine is) and it works fine. I have also tried reducing the complexity of the program and taking out the LDR readings in the code, and when I do this,  it does successfully turn on the relays as desired. For some reason it appears that the LDR is reading a full light level even when I place my finger over it, and because the IF statment in the program relies on a low LDR to operate, the code which turns on the relays never gets to execute.  At first it seems that there may have been a problem with the LDR, so I changed it  with a new one, but again it continues to read the highest value of 255 (or 1 byte) and therefore the program never executes as desired. I'm not sure why the LDR keeps reading the highest value. CAN ANYONE HELP!

Question by Mattdog123 7 years ago  |  last reply 7 years ago