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Nicely done! Keep it up.I have also made this Simle Fm radio with easy to find parts;http://www.instructables.com/id/Simple-FM-Radio-sure-Works/
Hi,I have a Sanyo R227 radio that, like others here, would just flash the screen every few seconds.I have no real electronic repair expertise, but I have a multimeter, and I managed to repair my radio, partly with the help of this site. I always keep spare AC adapters from old electronics that get recycled, so I decided to bypass (and remove) the power supply completely. I connected an old 12VDC power supply to the white (+) and brown (-) wires that used to come out of the old power supply. Similarly, I connected an old 5VDC (USB) power supply to red (+) and black(-).Works great!
Hi Milen,I didn't see your response sooner than today. I have been experimenting with things like this, so far no working mods. But I was wrong originally. The 100k resistors did add a tiny bit of distortion and no noticeable vibrato. I think the error occurred because I tested the guitar while it was hanging on the wall so it was unhindered enough to vibrate.Now after trying to mod it so much, I'm instead liking the small distortion it has and am in favor of building that pedal you showed me, I just need to scrounge together the parts. Thanks again :)
Salvaging a NOKIA 3310 LCD and using it with Arduino
Hi .Please write the type of both sensors. For the temperature sensor I suppose you have to serch the proper arduino library. The voltage sensor seems to me to have an analog output (check if true). In this case you have simply to use AnalogRead(A0). Check what should be the output voltage if you supply the sensor with 9V battery (as on the picture). If it is higher than 5V - an error will occur - you have to insert proper resistor voltage divider at the output of the voltage sensor and the analog arduino pin.
Hi,Check the connections of the voltage sensor - seems that the sig and supply pins are swapped. Is it not possible to supply this sensor with 5V arduino supply?Do not forget pull-up resistors needed for the I2C communication. I suppose that also the rx TTL pin shall be connected - some return data is send also during the communication.regardsMilen
Dear Milen,Thank you very much ! But i'm not sure about the code. If i connected IR Temp and Voltage Sensor(swapped it already) with Arduino, Should i write the code like "DigitalRead(A1, Voltage) and DigitalRead(SDA or SCL, Temp)" like this ?I know about doing code to show in LCD, But I don't know about sending/receiving data from TX/RX pin. Could you give me some hint ?Sorry for bothering you a lot.
Dear Milen, Thank you for your replied and sorry for my late respond. I read about SPI and I2C as you recommended, So i chose I2C be my answer because I have to measure in real-time and yes I2C has more speed than SPI. I have a design for my Arduino measuring Voltage and Temperature as this in attached picture. Will it work ? I will use TX port for sending data to "TTL to RS232" and then to PLC.
Hey again Milen!It worked!! I boosted the feedback resistors and it totally got louder. (Sidenote: mounting smd devices is very very tedious!).I did however go beyond the 2x ratio you mentioned (43kOhms -> 100kOhms) as a sound experiment, as I'm using this for guitar and I wanted to test how it would be because you mentioned that it might clip and I desired a bit if distorted sound. It ended up sounding a bit vibratoish. Is that oscillation and is that dangerous for the OP amp? Any thoughts on how to get a crunchy sound?Thank you, your so helpful!
Hey,Thanks I'll have to check them then. :)And thanks for the advice and the suggestion about the voltage. I remembered that it could be supplied by as little as 2 volts so I just use one 3v battery and it seems to work fine. Plus they're very compact and cheap if you know where to get them.Many thanks,Christin
Hi,The feedback resistors should be these placed between pins 1 - 2 and 6-7.May be they are SMD devices. Try to unsolder them and to measure their value with a ohmmeter. After that you could put new ones with higher value - but not more than 1.5-2 times.The maximum supply allowed is 5.5V. 6 V is the absolute maximum rating - applying this voltage for a long time could damage the amp and it is not guaranteed that it can have the full functionality when supplied with 6V.May be better solution could be 3 batteries 1.5V, or as in my case to add a voltage regulator from the type 7805. Then you could apply voltage till 30V.RegardsMilen
Thank you! You really did get me into electronics, I've never even used a soldering gun or an ohmeter before I read your article!Now, I couldn't originally find the datasheet for an unknown reason. (I just plugged in a 9 volt battery and it didn't work so I plugged in 2x 3 volt batteries I had lying around and it worked. Which in itself has me concerned because I just was able to find the data sheet and it's max voltage is 5.5 volts, is it ok to use 6?)But anyways, now that I've found the datasheet (here: http://pdf1.alldatasheet.com/datasheet-pdf/view/8932/NSC/LM4808M.html ), I think it says I can do what you're saying, if I'm not mistaken. I just have to figure out what and where the feedback resisters are lol. If you'd like to help, I appreciate it, but if you're busy, I understand.Thank you very much
You could try to boost the gain of the op-amp changing the feedback resistors if possible.
I am glad that I could attract another guy in the world of the electronics.You can identify the amplifier chip and find it datasheet. Some of the used chips are simply internally defined as buffers (no gain - only source-load resistance matching) - in this case nothing can be done. But is a standard power operational amplifier is used as amplifier stage, normally its gain is fixed by the feedback resistors. (these which connect the output of the amplifier with the corresponding input). If you increase their value - you also increase the gain. You should not increase them a lot because the amplifier can saturate (clip at the supply rails) or the gain increase can cause stability problems (the amplifier can start to oscillate).
Well after popping open a few other drives I found a super easy pcb and got it to work! it's a bit quiet tho, any way to make it louder by chance?
Oh, thank you! But I'm a super novice at this, how exactly do I do that?By the way, thanks for your instructable, it's the only one like it that I found and it's got me interested in all this sort of stuff.
Thanks,I think - you have to decide which type of communication you want to use : SPI or I2C and depending on this to define the used pins and libraries. From the code you can remove then the LCD and serial monitor part.
Dear MilenYou did a great job ! I have a project that need to use arduino as multimeter. Could you help me something? If i just want to use Arduino for measuring Current, Voltage, and Temperature and send the data to PLC, I don't need to show in LCD, but send to PLC.What is the code should i use in Arduino program ? If Arduino's TX pin connect to TTL to RS232 converter.
Webserver for home appliances control
Hi,I did not try, but I think that should be possible
Can I use this programmer for atmega328p?
Hi, the schematic can be found on step 7. If you do not want to use the kit linked here, the schematic with the LM317 regulator can be seen at step 1. All other connections are described in the text. Some of them depend on which regulator shall be used or which digital potentiometer. The design is done in the way that it allows a big flexibility and the schematics can be different in each particular realization.
I really want to make this, but I'm totally lost, and have never done anything like this before, will someone help me out? Here's the board I got to work with
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