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Resistor wattage specs? [message #30219] Sat, 22 January 2005 18:42 Go to next message
colinhester is currently offline  colinhester
Messages: 1349
Registered: May 2009
Location: NE Arkansas
Illuminati (3rd Degree)
Will 1/2 watt be enough for all the resistors? I'm going with either Riken (carbon film) or tantalums. Any one have a preference?

R1=R2=R4=1K, correct

Does R3 need to be exactly 100 ohm, or just close.

R5 = 1 megaohm

What about bleeder resistors for the caps? Value and wattage ratings?......Colin

I'm assuming we're still going with revision 2.


Re: Resistor wattage specs? [message #30225 is a reply to message #30219] Sat, 22 January 2005 20:02 Go to previous message
PakProtector is currently offline  PakProtector
Messages: 935
Registered: May 2009
Illuminati (2nd Degree)
Hey-Hey!!! R1,2,and 4 are the anti-oscillation dampers. 1/4 watt Xicon carbon comp from Mouser. Gate/grid stoppers need to be free from parasitic properties like inductance and capacitance as is possible. Hence the carbon comp specification. I don't know of a better sol'n to this requirement, and 100 of them is ~$5( here I go, spending *YOUR* money! )

I recommend a 500 R multi-turn pot instead of the 100R in the current setting position R3. Small device variation will cause dificulty in achieving a careful setting and matching of current regulation. You're going to set it and leave it( in Theory ), so durability should not be too much ov an issue. make it easy to replace if you're going to fiddle with it. And you can fiddle with it....
regards,
Douglas

....damn Thrintun!

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