Synare 3 bipolar supply?

hoyager · Joined: Feb 16, 2010 Posts: 27 Location: New Zealand

Hey there, I've been trying to find similar circuits to the ones in the synare 3 to get an answer, thought someone might be able to let me know off the bat..

http://clacktronics.co.uk/wp-content/uploads/2011/09/Clacktronics_Star_Synare_Schematic.gif

Is it just a matter of replacing all the 6v (vref) points with ground and all the grounds with -v?

VCF and VCA are pretty straight forward conversions

But the other parts...

CMOS 4093 oscillators: these should be +v and ground only right?

This would mean if using +/-12v it would use only +12v and gnd.

Would this result in a onesided wave though?

Envelopes: the grounds marked become -v?

Noise generator: grounds become -v?

Trigger Conditioner: grounds become -v?

The service manual seems to be more correct, as in marks the power points in a bipolar fashion, except the oscillators, which I'm starting to understand wouldn't be able to handle +12v at pin 14 and -12v at pin 7??

Andy

richardc64 · Posted: Wed Jul 31, 2013 2:30 pm Post subject:

WHY, exactly, do you want to do that?

hoyager · Joined: Feb 16, 2010 Posts: 27 Location: New Zealand

The service manual says, there will be hum if using an external power source with the current power scheme.

Also I already have lots of 15 and 12v regulators and don't want to use batteries.

Seems obvious especially as the original was meant to be hit with a stick but this seems to be a point of failure, the battery clips and attachments etc.

Really need someone who knows a bit about the power requirements of cmos and using cmos as an oscillator which would run through a vcf with *normal* bipolar supply and wether this would be fine.

I'm one step away from laying it out, just want to check if I'm on the right track

Cheers
Andy

fonik · Posted: Fri Aug 02, 2013 2:50 am Post subject:

hoyager · Joined: Feb 16, 2010 Posts: 27 Location: New Zealand

So the input and output jack grounds, would go to the dc adapter's ground, regardless of the rest of the circuit?

I think that might be the one, use 9v then the cmos are happy either way

Wonder why they didn't do that in the first place though, with 2 batteries and all...

richardc64 · Posted: Fri Aug 02, 2013 8:28 am Post subject:

Does anyone know off-hand how many posts there's been of someone trying to make something single-supply into bipolar and then FUCKED IT UP?

hoyager · Joined: Feb 16, 2010 Posts: 27 Location: New Zealand

I'll try and keep that in mind (not fucking it up)

The VCF and VCA are going to work better on bipolar (which are the main parts of the whole circuit) and I already know how they 'convert', having built OTA based vcf's running on bipolar before.

If the cmos chips can def be run from +9v at vdd and -9v at vss, then I think its going to be all good.

Except the trigger conditioner...

It would be more difficult the other way wouldn't it, bipolar to single supply?