[sdiy] Synth module in non-synth app

[Harry Bissell Jr]

Possible... but using a lamp like that would be a huge hit in
  system reliability.  Lamp can burn out / damage from vibration.
  
  next ?   :^P
  
  H^) harry

Oren Leavitt <obl64 at ix.netcom.com> wrote:  You might try a simple 12V incandecent lamp in series with the solenoid 
coil.
The inrush current to the cold lamp will give the coil the full 12V 
"kick" it needs to start. As the lamp warms up, its resistance will 
rise, resulting in reduced voltage across the coil.
Choose a lamp the settles to your desired 6 to 8 volts.

Hope that helps,
Oren

Nick Liebrecht wrote:
> Hi all,
> 
> I need to make a circuit to protect some solenoids in a flow cell  from 
> getting too hot.  Basically, I need to apply 12V to the solenoid  coil 
> for about 100ms, and then bring it down to about 6 to 8V.  I  measured 
> the maximum current through the solenoid to be around  225ma.  I was 
> thinking of using an ADSR to create the proper voltage  transients, 
> followed by an emitter follower (using a PN2222A,  Ic=500ma) to provide 
> enough power to actuate the solenoids.
> 
> I need six of these, and i was thinking of using the ASM-1 ADSR as a  
> starting point, replacing all the pots with the appropriate resistor  
> values for the timing and sustain level I need.
> 
> Does this sound like it will work???
> 
> Thanks,
> Nick Liebrecht
> nick.liebrecht at gmail.com
> 


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