Help with the Battery Operated High Voltage Generator from Goldmine

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#9
rayma said:
For an ESL with a very low current draw, probably that would be ok,
or else substitute a much smaller value cap.
Click to expand...

For an ESL, the large output cap is not necessary. Also, to operate in the preferred constant-charge mode (which offers the lowest distortion) a high value resistor should be placed in series between the supply and the panel's diaphragm. 'High value' as in at least 50 megohms, and the higher the better. Acoustat used a 500 megohm resistor with very good results.
 
#10
Ha, I used one of these (well a pair) for the bias feed on my new CLS Interfaces I built - works great. I used a 9vdc wall wart and slapped together a LM317 voltage regulator to control the voltage in from 1.25vdc (around 600vdc out) to 8vdc in (around 6000vdc out?) I also put the Quad Neon charge indicator (neon lamp with parallel cap in series with bias feed) and can see the bias charging the diaphragm. Neato. My CLS only need 2200 - 2400vdc before they start to sizzle.
 
#11
john65b said:
Ha, I used one of these (well a pair) for the bias feed on my new CLS Interfaces I built - works great. I used a 9vdc wall wart and slapped together a LM317 voltage regulator to control the voltage in from 1.25vdc (around 600vdc out) to 8vdc in (around 6000vdc out?) I also put the Quad Neon charge indicator (neon lamp with parallel cap in series with bias feed) and can see the bias charging the diaphragm. Neato. My CLS only need 2200 - 2400vdc before they start to sizzle.
Click to expand...

I ended up using a variable DC power supply and around 3V my panel sounded fine. As I increased to 4 - 5V it started to sizzle as well. My panel likes 2500 to 3000v. The LM317 is a good idea and I may do that. The charge indicator is a cool idea too.

Thanks
Elias
 
#12
AcoustatAnswerMan said:
For an ESL, the large output cap is not necessary. Also, to operate in the preferred constant-charge mode (which offers the lowest distortion) a high value resistor should be placed in series between the supply and the panel's diaphragm. 'High value' as in at least 50 megohms, and the higher the better. Acoustat used a 500 megohm resistor with very good results.
Click to expand...

Hi,

I would like to extend this a little bit.
The constant charge mode mostly depends on the resistance of the coating used. Too low, and series resistor would not solve all the problems(as charge is allowed to travel across the surface). With high enough surface resistance the value of series resistor is not very important, since the membrane can not charge or discharge fast enough considering frequencies involved.

Regards,
Lukas.
 
#13
Hello ESL Pros - quick question - will reversing the polarity of the Bias (from pos to neg) repel the diaphragm with no signal? I think I know the answer (no, will not), but I have been thinking of trying it for a while - reason is I have one panel that diaphragm collapses to back stator at a lower bias voltage than the other panel. If I were to reverse the polarity on bias maybe the diaphragm would remain fully suspended? I would have to do both and reverse the step up tranny to keep proper polarity to original music
 
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