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Old 5th October 2012, 08:03 AM   #8121
RCruz is offline RCruz  Switzerland
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Quote:
Originally Posted by Salas View Post
Find it with a trimmer first because it will deviate from theory with available Vds, warm up, your measuring accuracy, things like that.
You are right

Anyway, if I start with only a 500 ohm trimmer can I expect to be able to get 35Vout ?
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Old 5th October 2012, 08:09 AM   #8122
Salas is offline Salas  Greece
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Yes somewhere around mid point if with 30K ref resistor.
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Old 5th October 2012, 09:02 AM   #8123
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Thank you Salas
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Old 5th October 2012, 11:20 AM   #8124
Salas is offline Salas  Greece
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Hi Ricardo,

here are the values I used :
R4=6,790K
C1=46,94nF
C2=15,080nF
C3=47nF
R14=46,93K
R1=180R
I remembered now I had a couple of 47K Z-Foil 0.1%. So I dug them up. No, they are 47K. Its the UT-61E that shows both 46.93K. The LCR meter when in range 2 & 1kHz (calibrated short and open on its Kelvin leads just before), cycles 46.99K and 47.00K every half a second. My 50000 count DMM shows 46.995K when delta zeroed. Check your R4 again too. Caps at 1kHz they must be measured, cycle ranges manually. R.C. he is gonna pull the sims out instantly, I see it coming.
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Old 5th October 2012, 12:14 PM   #8125
vgeorge is offline vgeorge  Greece
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I did check with my LCR meter and got the same values. Only cross checked with the UT-61E. May I will make a fresh calibration with my LCR and check again.
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Old 5th October 2012, 12:19 PM   #8126
Salas is offline Salas  Greece
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Range 2, 1kHz remember. Gave me surely smack close to 47.00K on both EQU ser par. Those resistors are laser trimmed to 0.1% 0.2ppm grade if you got them from England. They can not really be 46.93K. They can be 47K +/-47 Ohm max. Its the DMM which is 0.5% plus 10 counts at that range (only 4 digits utilized).
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Old 5th October 2012, 12:29 PM   #8127
vgeorge is offline vgeorge  Greece
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I am sure checked them at 1kHz. Got them from here : Vishay VAR-Series "naked" Z201 Z-FOIL RESISTOR
Still more than 1% now that I think about that.
Will check again.
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Old 5th October 2012, 12:38 PM   #8128
Salas is offline Salas  Greece
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Mine are are 0.1% grade. Still 1% is +/-470 Ohm max error.
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Old 5th October 2012, 01:16 PM   #8129
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Quote:
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Mine are are 0.1% grade. Still 1% is +/-470 Ohm max error.
Mine 0,01%

Last edited by merlin el mago; 5th October 2012 at 01:29 PM.
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Old 5th October 2012, 01:30 PM   #8130
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They can be produced from 1% down to 0.01%. You are intrepid fox as always. Watched all the details before ordering and bought pricier on the know.
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