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Old 9th June 2002, 11:55 PM   #1
LaZarus is offline LaZarus  Netherlands
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Question Preamp source select

Im planning to build the esp project 88, as my first complete DIY audio project. Constructing this design shouldn't be a big problem, but if anyone has suggestions, please let me know.
I want to use an relais source select for my inputs, instead of an rotary switch, but I can't find any schematics.
Maybe someone can help me out.
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Old 10th June 2002, 09:25 PM   #2
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Default switching inputs by relays

How many different inputs do you wish to switch between, i.e. choose one out of how many?
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Old 11th June 2002, 08:16 PM   #3
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We have an input module which is relay switched. 5 line inputs plus tape in and out plus switched output. Relays take +5 Volts to operate so may be used with remote circuitry. The backplane PCB also contains the phono sockets for convenience. I'll post a picture on the website next week.

Hope that helps, Les

www.users.zetnet.co.uk/avondale
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Old 12th June 2002, 05:27 PM   #4
LaZarus is offline LaZarus  Netherlands
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Let's see,

To start with, I need the following inputs:

1 cd
1 pc
1 tv
1 tuner

later I will add a phono input and a aux input.

So that makes 6 inputs to switch between.

Les, you from Avondale also make Quad 405 upgrades, don't you?
Maybe you can provide me with some information?
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Old 12th June 2002, 05:35 PM   #5
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Thumbs up switching inputs by relays

If you can do with four inputs (= four relays) you can control them by wiring 2 double throw toggle switches on the front panel.

i.e. four combinations

00
01
10
11

Each combination switches on a different relay.

The relays can be mounted on matrix board near the input sockets.

This is what I put on my own preamp.

If that is the sort of thing you are thinking of, I can do you a more detailed diagram.
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Old 12th June 2002, 07:44 PM   #6
Kermit is offline Kermit  Norway
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Here are some interesting schematics from the net, I havenít tried any of them but they look interesting:

http://users.otenet.gr/~athsam/digit...down_sel_8.htm
http://users.otenet.gr/~athsam/Electronic_sel_8.htm
http://users.otenet.gr/~athsam/elect..._10_step_d.htm

I'm thinking about using the last one myself, except I want to use some sort of up/down counter to control it.

Hope you find some of it interesting.
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Old 13th June 2002, 10:44 AM   #7
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Exclamation relay wiring

If I may flag up one point that I daresay everyone knows: it is usual to put a diode across the relay coil to protect against back emf.

Whichever ingenious circuit is used, you ought to remember those diodes.
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