[sdiy] Overdriving 4069UB

[harrybissell]

don't need +/-5V...

just use 5V. who cares ?   You could use a simple
7805 or a shunt regulator (zener) and series
resistor.

Don't forget a good decoupling cap...

H^) harry

Seb Francis wrote:
> 
> Scott Gravenhorst wrote:
> 
> >>>
> >>>
> >>Yeah I did notice it uses a lot of current .. about 28mA with no
> >>signal.  This could be a problem because I plan to use the other 3
> >>buffers for a 2nd channel of distortion.  When 28mA was measured the
> >>other 3 inputs were hooked to 0V, so I'd imagine it would take more like
> >>56mA when using all 6 buffers.  This equates to 840mW at 15V (the
> >>absolute maximum is dissipation on the datasheet is 700mW).
> >>
> >>Any way round this?  A heatsink perhaps?
> >>
> >>
> >
> >Maybe lower the supply voltage.  +/- 5V ?
> >
> >If you must have 15 volts, I would do this with either 2 x 4007 or 2 x
> >4069UB.  I've done linear stuff with a 4069UB, but not using all six
> >inverters that way.  I made a dual triangle LFO with a 4069UB and it got
> >warm, running at 8V.  Two of the inverters were integrators, 4 were used
> >to make two schmitt triggers so not all the amps were linear.
> >
> >
> I'm leaning towards the idea of using 2 x 4069s.  I'd prefer to stay at
> 15 volts because that's what power I have available (and actually I
> think even at 10V, using 6 inverters in linear mode will be pushing it).
> 
> Anyway, I was a bit worried about cross-talk when using the same device
> for 2 channels, so it would also be better from this point of view just
> spend the extra 20p and use 2 :-)
> 
> Seb