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 Forum index » DIY Hardware and Software » Developers' Corner
Help with clocked sequential switch
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Slippery Slope



Joined: Jul 14, 2012
Posts: 2
Location: Denmark

PostPosted: Sat Jul 14, 2012 11:28 am    Post subject: Help with clocked sequential switch Reply with quote  Mark this post and the followings unread

Hi,

Great forum you have here. I have been building effects, noise-makers and synth modules for a couple of years and have found valuable info here several times.

The other day I found I had a 4017 decade counter and a 4066 quad switch lying around and thought I'd build a clocked sequential switch where 1 of 4 different inputs, one after another, would be routed to the output. The 4017 circuitry I took from Ken Stones gate sequencer and this of course works fine. Being the ignorant I am, I then thought that the 4066 switches would work like any spst switch and simply close on a high and let any AC or DC pass unaltered. I powered the 4066 with +12V to ground and quickly learned it was not that simple.
Now via some googling I have found out how I can build the circuit and make it work for audio signals (for instance by level shifting the input signal) but still I want the switch to work for both audio signals and DC and furthermore I don't want the circuit to grow too big.

Now instead of the 4066 I thought about using something like Analog Devices' ADG1211 or ADG5212. Question now is, would that work? And if so, which one should I go for?

Any advice is appreciated.

Regards
Slippery Slope
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JovianPyx



Joined: Nov 20, 2007
Posts: 1214
Location: West Red Spot, Jupiter
Audio files: 157

PostPosted: Sat Jul 14, 2012 1:16 pm    Post subject: Reply with quote  Mark this post and the followings unread

As a side note - if you power the 4066 from a bipolar supply at +7.5v and
-7.5v, you will not violate it's nominal maximum voltage and it will work with
both AC and DC within the range of -7.5 and +7.5 volts.

Most of the data sheets I've seen show an "absolute maximum" of 18 volts,
so you should be able to get away with +9 and -9 for those manufacturers.
I've done it with +8 and -8 and had no problems.

Using a bipolar supply complicates the logic switching a bit, since the control
voltage for the switches needs to be referenced against the negative supply
and not ground. However, it can be done.

Sorry if this doesn't help, just thought I'd throw it in there if you wanted to
try it. I know that many analog systems use higer voltages, so it may be
completely inappropriate for your use.

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ejr27233



Joined: Feb 08, 2010
Posts: 44
Location: UK

PostPosted: Sat Jul 14, 2012 2:15 pm    Post subject: Reply with quote  Mark this post and the followings unread

Have you seen this??

http://www.modular.fonik.de/Page32.html
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Slippery Slope



Joined: Jul 14, 2012
Posts: 2
Location: Denmark

PostPosted: Sat Jul 14, 2012 3:05 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi,

Thanks for the answers both of you! I think I'll use the DG412 as shown on the schem you posted, ejr27233. They aren't that expensive on ebay and I would like to be able to switch all sorts of signals.

Thanks again,
Slippery Slope
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