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Adjusting R3 [message #30726] Sat, 26 February 2005 12:21 Go to next message
colinhester is currently offline  colinhester
Messages: 1349
Registered: May 2009
Location: NE Arkansas
Illuminati (3rd Degree)
Damir siad to adjust R3 so there is 15mA. What are the test points? Is the current measured across R3 itself?.....Colin

Re: Adjusting R3 [message #30746 is a reply to message #30726] Sat, 26 February 2005 17:08 Go to previous message
PakProtector is currently offline  PakProtector
Messages: 935
Registered: May 2009
Illuminati (2nd Degree)
Hey-Hey!!!
For this you ignore the mu output. Put the ammeter or sensing resistor in series with a 9V battery. + to the upper drain and - to the plate end of R-3. Watch the meter and adjust until the CCS is passing the 15 mA of current.

If you use a sense resistor, use Ohm's Law to determine curent. If you use the mA function then you'l get the reading directly. It will probably come in when R-3 is ~150R or so.

Call if you wish, I will talk you through it.
regards,
Douglas



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