[sdiy] controlling VCO with guitar

[dan snazelle]

i use a 12-15 dollar DC to DC converter in the mini-ark and the tracer city

thanks



On Jan 20, 2011, at 11:55 AM, Harry Bissell wrote:

> lol (DESIGNING WITH CHARGE PUMPS TODAY)
> 
> Most charge pumps have about a 6V max input, so doubling a 9V might be tricky. If you did double, and invert negative you
> could get roughly +/- 18V (unregulated) at light currents. Possibly you could use an LDO regulator to get +/-15. As you are switching
> anyway you might be better off with an inductor based solution. 
> 
> Capacitors will have high inrush currents (think spikes) and inductors will have lots of noise when they switch off (think spikes). 
> Hey, its a switching regulator either way...
> 
> H^) harry
> 
> 
> 
> ----- Original Message -----
> From: ASSI <Stromeko at nexgo.de>
> To: synth-diy at dropmix.xs4all.nl
> Sent: Thu, 20 Jan 2011 11:35:28 -0500 (EST)
> Subject: Re: [sdiy] controlling VCO with guitar
> 
> On Thursday 20 January 2011, Paul Perry wrote:
>> It's not trivial to get +-15v with charge pumps - check the input voltage
>> ratings on the cheap pumps.
> 
> Not sure what you mean by charge pumps (the only ones I know that are true 
> charge pumps are for TTL->RS232, e.g. from Maxim), but you'd have a hard 
> time drawing much curent from one of those.  There are however inductor 
> based DC/DC converters that have +-12V and +-15V output.  Traco has some 
> isolated ones with 4:1 range input starting from 4.5V that are rated 3W, for 
> instance.  Ripple voltage is something to look out for, so you might need to 
> follow with a pair of linear regulators to clean up.
> 
> 
> Achim.
> -- 
> +<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk Blofeld]>+
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> Harry Bissell & Nora Abdullah 4eva
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