RE: Cotrolling amps that don't have a remote control

["Harrison, Mark (Alliance)" <mark.harrison@xxxxxxx>]

Do not want to replace the amp at all.=20

Number one priority is sound quality, and in the context of my system, I
wo=
uldn't replace the Shearnes for anything less than =A310,000 worth of
Chord=
amps. To be fair, this would also give me the remote control, but I don't =
actually have =A310,000 I
want to spend on amps this year ;-)

Regards,

Mark

-----Original Message-----
From: Nigel Orr [mailto:Nigel.Orr@xxxxxxx]
Sent: 09 June 2000 10:13
To: ukha_d@xxxxxxx
Subject: Re: [ukha_d] Cotrolling amps that don't have a remote control


At 09:26 09/06/00 +0100, you wrote:
>However, they don't have a remote control. How do I automate the
volume?

Build or buy?  If build, you could use one of the Dallas Semi digital=20
potentiometers, and build an IR interface.

If buy, easiest would be a separate preamp with remote control.

If the crucial thing is not to change the signal path in any way, a
motor=20
on the volume pot would be the easi_est_ (or only!), but it wouldn't be=20
easy!  Things to bear in mind, will you want to control it manually?  Will=
=20
the motor/gearbox drag make that difficult?

>1: Is this viable?

Certainly possible

>2: Would the emf affect the sound?

Depends on the amp- even so, it would only make noises when the motor is=20
running.  You'd need to be reasonably careful about your IR interface too,=
=20
if it is to be mounted internally, but it shouldn't be much of an issue if=
=20
the amp is stable inside, as everything is at line level or above.

>3: Does anyone know of a suitable product?

Depends whether you want to 'mostly-analog-electronics-build' (VCA and
IR=20
interface), 'mostly-digital-electronics-build' (Digital pot and IR=20
interface), 'mostly-mechanics-build' (motor and IR interface) or 'buy'
(any=
=20
remote controlled preamp, or preamp kit (like Velleman one from Maplin)).

Lots of choices... which one do you want?

Nigel


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