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Yes, the ground is shared, but i tried isolating the fan by using a B0505S isolator (worked great for other ground related noise problems so far), but the result was the same.
I used this simple circuit as a base for my amplifier:
I just added a TDA1524 for tone and volume control, a uPC1237...
Hello,
I have 2 very annoying issues regarding audible noise evidently entering through ground.
First one is the classic: 100Hz hum. I reduced it substantially by using shielded wire for all the air wires, but it still reappears when any high power mains device is turned on (e.g. electric...
Why do you think so? I already managed to make some cd changer emulators for the same cause, using atmega. I figured it might need an external oscillator, as atmega does too. Is there something big I'm missing still?
The guy seems to connect pins 10-12 of PCM1803 to cd pins WS, DATA and CLOCK...
Hello guys,
I wanted to order this neat ADC breakout board from sparkfun, which employs a PCM1803 chip to do the conversion. However, it is not available in my country and it seems to be discontinued elsewhere too. But I managed to get my hands on the PCM1803 chip itself, so I'd very much like...
I already removed the battery, that's why I'm trying to figure out where the positive and negative terminals are at the charger connector, not at the battery. That way I could reuse a phone charger, which is used to charge the same type 3.7V Li-ion batteries.
Hello people,
I have this old Samsung YP-P2 mp3 player, but its original charger is long gone. I can make one at home, but a silly problem arose - I can't find the charger connector pinout for the life of me. Does anyone have it by any chance? Thanks in advance! :thumbsup:
Great idea. Totally forgot those multiplexer/comparator chips, I guess I got spoiled by Arduino doing all the work. :D I think I'll try applying 74HCT08 for the job, since I had some of them lying around. I'll keep you posted if anything good turns out or if I'll figure out another way of doing...
Hello all,
I have a rather simple question which i can't seem to figure out on my own. I want to add extra functions to existing car radio push buttons.
I am fiddling with my car radio to retrofit a usb port to it. I already managed to do so by using an mp3 module from ebay, but ran into this...
Hmm, it reads 0.17 when taken out. It reads an open circuit when polarity is changed, so it would seem the diode is ok, except for the abnormally low voltage drop :???:
Hello,
I am working on a APC UPS faulty board and have run into a problem: 1N5819 diodes read 0.02V drop across them when tested using multimeter (the diodes are soldered in place). That is the same even if i switch polarities of the multimeter. When using continuity check it reads 20 ohm and...
Hi guys,
I'm currently working on a project involving 2 arduinos + 2 LCD screens + 2 GPS modules + 2 nRF24l01 modules. The idea is to create a warning system for trains. It's based on the speed of the locomotive and the speed of the last wagon. The point of that is knowing whether any of...
EDIT:
My patience has ended and I went to buy an original u-blox neo 6m module, which has EEPROM memory and a much larger antenna. It works a treat, so it must be something wrong with GPS Bee antennae, I'll keep you updated if I figure anything out.
Good day to all,
Firstly, I want to apologize if I'm writting in the wrong forum. :oops:
Now, on to the business. I have bought a GPS Bee kit (a u-blox Neo 6M gps module in a XBee compatible board) and I'm having a huge headache thanks to it (photos of the module are in the attachments).
The...
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