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From: Mike Poulton
Subject: Re: making IR unit out of old vcr
Date: 1 Oct 2002 18:09:16 GMT
Organization: MTP Technologies
References: <email@example.com> <firstname.lastname@example.org>
On 01 Oct 2002, email@example.com (Blizzard) said:
>> no, there is usually no volume control on a VCR. Look for an old
>> amplifier or ghettoblaster instead. For a volume control you need a
>> special circuit with a multiplier not just some switching functions.
> OK..yes with no volume control on the vcr circuit itself, but i have a
> set of powered speakers that have volume/power on them...so what i was
> going to do is say wire the vcr circuits channel up/down for the
> volume control. It's sounds half assed, but if i can get the vcr
> circuitboard to light/power up so i can use the IR functions on it,
> i'm sure i can wire the whole shebang into the speaker amp and have
> the vcr boards channel up/down as a suitable volume up/down.
I don't think you can count on that. The IR receiver outputs a digital
signal that corresponds to the different button presses on the remote.
The tuner unit in the VCR accepts a digital signal for channel
selection. At no point in the circuit is there an analog representation
of the channel value. In order to interface this with your speakers,
you will probably need to use a microcontroller (or complex discrete
digital) and a DAC (or improvised version thereof). It would be easier
to build it from scratch.
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