Tera Ohm Meter – Power Supply by ICL7650
This entry was posted on Saturday, March 15th, 2008 at 10:22 am and is filed under high voltage power supply, meter.
The parts list which is not in the circuit is listed below, the circuit is 15 years old so you may have problems getting the parts, but you may get some idea on high resistance measurement.
IC1 ICL7107 A/D converter 31/2 intersil maxim
IC2 ICL7650 chopper stabilized amplifier intersil maxim analog
IC3 CA3140 any opamp Texas Instruments
IC7 IC9 NE555 timer National Semiconductor
IC8 LM723 regulator National Semiconductor
the above list is from my memory, hence it may be wrong, i have forgotten this circuit, this circuit was scanned by a hp photosmart and resized and optimized by irfanview. also note the technology may be obsolete, but basic idea is still the same today.
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Read More Source:
http://schematics.blogspot.com/2006/07/tera-ohm-meter-power-supply.html
Thank you.
