charge pump with BBDs

[Dimitree]

Hi guys
I've managed to get a charge pump to get +15V and -15V from a 9VDC supply..with no noise.
well now I'm wondering if I can power BBDs, for example, the MN3005/MN3008 that require -15V.
would it give me noise, since there's the BBDs clock yet in the circuit?
the LT1054 would give 50mA if doubled, and so 25mA if double+inverted.. How much current would need, more or less, a circuit like the Deluxe memory man, with 2 BBDs?
I believe I would need to use 2 or more charge pump in parallel..

[Mark Hammer]

Hmmm, that makes two clocks on-board: one for the BBD and one for the charge pump.  What frequency do folks normally run a charge pump at?  Is there a risk of audible heterodyning?

My first inclination would be to avoid a charge pump and BBD on the same board, but I just may be unnecessarily over-cautious.

[earthtonesaudio]

Or use the BBD clock as the charge pump's oscillator input.  A single clock avoids the risk of heterodyning, but now you have a BBD supply voltage that varies along with the delay time; shorter delays = higher voltage.  It would perhaps enhance the "BBD sound" whatever that is, by decreasing headroom on longer repeats.  ...This might sound horrible, awesome, or no different from normal.  I have no idea.  But if it does work it would be very elegant.

[Dimitree]

that would be a too risky experiment for my BBDs..

so as best solution, I could do a little pcb with charge pump (or pumps) to supply the main pcb, and if this won't work, then I could just remove this pcb and use a power supply..