Computerman29
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Computerman29 said:OOPS!!! I forgot. Thanks.
I soldered a 100nF 0805 between power pins on the bottom of board. It now passes all tests, but it still won't calibrate.
The software reads Vdd= 4.1v Vpp=Vdd on 3v devices and Vdd= 4.5v Vpp=11.9v on 5v devices.
My meter reads Vdd=4.23v Vpp=Vdd on 3v devices and Vdd=4.61v Vpp=12.04v on 5v devices.
Vdd seems a bit high for 3v devices, but the software says it passes.
BTW, the MOSFET's are ON Semiconductor. The N-channel is p/n:NTD3055L104 The P-channels are p/n:NTD20P06L. The op-amp is Microchip p/n:MCP6271-E/P.
The .zip file opens with Winzip or WinRar. The .sch and .brd files open with Cadsoft Eagle.
Thanks FunnyNYPDfunnynypd said:The ver2.40 still has the voltage calibration function.
Did you make a single sided PCB with all red wires hand wired with jumpers?Computerman29 said:There is one more thing that I think I should point out to anybody who builds this:
OBSERVE THE POLARITY OF THE TRANSISTORS VERY CAREFULLY!!!!!!
The transistors in the circuit are ECB (not EBC like most others). They could easily be changed to avoid confusion or if BC639's and/or BC640's are unavailable locally. The only reason I used those transistors is because I was out of the 2N3904/2N3906's that I normally use. Have fun!!
Peace
Did you make a single sided PCB with all red wires hand wired with jumpers?
I have already indicated the need for checking the FET polarities in my post dated 28-2-08. That should be valid even for Transistors.
Congrats that you have made to work.
Computerman29 said:Did you make a single sided PCB with all red wires hand wired with jumpers?
Yes. That is correct. Quite a lot of jumpers, but it kept it single-sided. They seem to go all over the place, but I did not want to cross them and cause drc errors and other problems. Perhaps you or somebody else could do better. Like I said before, I am somewhat new to PCB layout design (but not to electronics).
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It would be better to install and use Eagle-The job wold be done and you learn too. the PDF converters carry some distortion as I experienced personally. Re-sizing would be a problem.wakaka said:Hi TS, can u translate the schematic and layout to pdf format as i dun have eagle. Or to a gif file?
THere is free pdf translator available, which is pdf995.
thanks.
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