rickcr42
Are YOU talkin' to me?
- Joined
- Jun 21, 2001
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Quote:
sure does.1,000 uf elna in parallel with two 10uf SCR.
This for me was a better option than the dual supply with DC balance pot which by the nature of an adjustment means it could drift AND the cost for me of a dual power supply considering how much experimentation was involved would have been prhibitive.
At present I have a pre-regulator running at +30 volts followed by CLC filtration and a final shunt regulation stage for each mosfet at +24 volts.My source load is not a resistor but an inductor which raises the efficiency a bit though i can't say it sounds better than the simple power resistor.
JFETS and MOSFETS seem to like power and for me +12 to +15 volts wasn't getting it done.
But for a first build i would go the simple route with a basic DC supply of 13.6 volts@3 amps (your basic car battery eliminator supply) then the LM317 regs at +12 volts and keep the drain resistor in the 250 to 300 ma range.More is not rewally needed and I found this through using a 40 ohm 5W rheostat so i could "dialk in" as much or as little current as i wanted (inline with 10 ohm 10 watt resistor just in case i got careless and hit "0" ohms )
This particular amp sounds pretty darn good built "honest",straight from the headwize project library, but being so simple leaves a LOT of room for experimentation later on without undue complexity.
Once you KNOW the amp amd how it sounds ,then it is time to fiddle with current sources,power supply upgrades and mosfet gate isolation
rick42, does your amp use an output cap? |
sure does.1,000 uf elna in parallel with two 10uf SCR.
This for me was a better option than the dual supply with DC balance pot which by the nature of an adjustment means it could drift AND the cost for me of a dual power supply considering how much experimentation was involved would have been prhibitive.
At present I have a pre-regulator running at +30 volts followed by CLC filtration and a final shunt regulation stage for each mosfet at +24 volts.My source load is not a resistor but an inductor which raises the efficiency a bit though i can't say it sounds better than the simple power resistor.
JFETS and MOSFETS seem to like power and for me +12 to +15 volts wasn't getting it done.
But for a first build i would go the simple route with a basic DC supply of 13.6 volts@3 amps (your basic car battery eliminator supply) then the LM317 regs at +12 volts and keep the drain resistor in the 250 to 300 ma range.More is not rewally needed and I found this through using a 40 ohm 5W rheostat so i could "dialk in" as much or as little current as i wanted (inline with 10 ohm 10 watt resistor just in case i got careless and hit "0" ohms )
This particular amp sounds pretty darn good built "honest",straight from the headwize project library, but being so simple leaves a LOT of room for experimentation later on without undue complexity.
Once you KNOW the amp amd how it sounds ,then it is time to fiddle with current sources,power supply upgrades and mosfet gate isolation