Re: How to designg a simple Dual complementary SPST CMOS with a single control
From: N. Thornton (bigcat_at_meeow.co.uk)
Date: 11/02/04
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Date: 2 Nov 2004 09:18:22 -0800
cablespec@3web.net (cablespec@3web.net) wrote in message news:<b8b7ae38.0411012205.6ea18a69@posting.google.com>...
> Thanks for your answer.
>
> In fact, I have an old peavey Deuce series VT with 3 IC TL604CP
> defect. What I'm looking for is an easy way to replace them. The
> TL604CP is an obsolete part and to get them ... I have to order 100 of
> them at $2.90 us each.
>
> The only information that I could provide you is the supply voltage
> +16 and -16 Volts. The control voltage is about 8 volts.
>
> I'm trying to figure out how to do it ... but I'm not a specialist in
> the field of circuit design.
>
> I know that it is possible to design a simple circuit with a couple of
> resistors and FET or using a CD4066.
>
> Here is what I found:
>
>
> FET1 FET2
> input ---- R1---- | ----------| |----------------------- output
> | | |
> | ------
> | | |
> |- |
> Vc2 ---- |
> |- vc1
> |
> |
> |
> GND
>
>
> This is a Jfet zero signal switch. The series jfet is connected with
> its source on the buss. This is a virtual earth, so the control
> voltage to the gate will effectiveley be grounded referenced.
>
> Q1 OFF ON
> Q2 ON OFF
> Vout OFF ON
>
> and:
>
>
> Voltage control ---------- VC1 ----Vc1
> |
> |
> |
> ----- inverter ---vc2
>
>
>
> So ... could you help me more with the information requested?
>
>
> Thanks a lot!!!
>
> Mike
Im not really understanding where the problem lies. Discrete fets or a
4066 should do this fine. I'm assuming youre switching audio inputs.
With a fet, toggling the gate hi/lo switches the main channel on or
off. 2 can be used when greater ron/roff ratio is needed.
NT
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