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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Anyone recognize this PCB. (motorized pot)?
Anyone recognize this PCB. (motorized pot)?
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Old 24th May 2019, 07:28 PM   #1
toastytoy is offline toastytoy  United States
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Default Anyone recognize this PCB. (motorized pot)?

I have had this PCB laying around for ages and i am pretty sure its for a motorized pot. I dont remember where i got it and there is zero documentation. There is a 5v relay, a attiny24a chip, some jumpers, ect. I have an alps motorized pot that i would like to put into a preamp im building so if anyone can tell me anything about this i would much appreciate it.

-Mike



If anyone could shed some light on this it would be much appreciated.

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Old 24th May 2019, 07:48 PM   #2
Nico Ras is offline Nico Ras  South Africa
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Your guessed right.

M1 and M2 drives the motor on the pot. J1, I am guessing goes to some relays for the input selector, and I am also guessing that the relay output LCOM (common) LNO (normally open) LNC (normally closed) could be used to switch the pre-amp power on and off or signal a power amp, to turn on or off.

AC1 and AC2 is the power supply transformer secondary for this board, it already has a bridge diode, filter capacitors and a regulator on board. Identify the regulator and choose the transformer to be about 4-5V above that.

What the jumpers and settings are is also anybodies guess. I cannot see the label on the IC but maybe Google its data sheet it may be available.

That is my take on the board. I trust you have its remote control else this may be useless as a remote controlled volume control.
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Old 24th May 2019, 10:30 PM   #3
toastytoy is offline toastytoy  United States
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I do have the remote controll, and the regulator is a 5v so thats cool. But i am still scratching my head about what the jumpers and the 5 pins of "J1" do.
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Old 24th May 2019, 10:38 PM   #4
Nico Ras is offline Nico Ras  South Africa
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You may get the answer from searching for the IC's data sheet. A single output transformer of 6 - 9 VAC rms would work fine for the module.
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Old 24th May 2019, 10:43 PM   #5
Nico Ras is offline Nico Ras  South Africa
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Having another zoom in on the relay it seems to be used as an input selector between two inputs, a default which would be LCOM to LNC and RCOM to RNC and pressing some button would flip to the NO side of the switch.
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Old 25th May 2019, 11:31 AM   #6
Nisbeth is offline Nisbeth  Denmark
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Anyone recognize this PCB. (motorized pot)?
Quote:
Originally Posted by Nico Ras View Post
You may get the answer from searching for the IC's data sheet.
The IC is a micro-controller, so whatever features it has a defined in software
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