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Electronics => Repair => Topic started by: vidarr on March 06, 2020, 08:00:10 pm

Title: Dual CA810 AMP Rebuild Broken Resistor
Post by: vidarr on March 06, 2020, 08:00:10 pm
A few weeks ago, I found an old amplifier for a car that has two CA810 Amp ICs. There are a few problem. The first was it was missing a pin, so I put the IC on a header, ground down the plastic package until I hit the top of the pin, then I soldered a new copper pin to the IC. It doesn't look that good, but it works like new.

The next problem, I broke one of the resistors for the circuit in half removing it from a board. I am pretty sure I cannot glue this back together. It is a 1 Ohm resistor. Online, there are some ways to create resistors, but they all seem kind of 3rd world sketchy. The nichrome wire method seemed promising, but I cannot get a stable 1 Ohm resistance from it. Is there a simple way I can make this 1 Ohm resistor? A trip to the electronics store for me is a whole day event just to get there and get back home.

Thanks!

Title: Re: Dual CA810 AMP Rebuild Broken Resistor
Post by: Gyro on March 06, 2020, 09:30:45 pm
Doh, you were doing well too.

Nichrome would be a pain to solder. What low value resistors do you have. Maybe you can make up a parallel combination to achieve 1 ohm.
Title: Re: Dual CA810 AMP Rebuild Broken Resistor
Post by: vidarr on March 06, 2020, 11:03:16 pm
Everything that I have on hand is on other boards. I would have to search. I was willing to spend an hour, or two, on that. I was hoping to find a simpler solution.

I was also hoping to find a better circuit than the "test" circuit from the datasheet, but I have not found any alternatives.

Thank you!