Based on CMOS logic gates, this circuit was found in an Electronic Design from the 90s. The circuit is for voltages from 11 to 15V, but it can be changed,
Measuring capacitances and resistance this simple instrument was found in Radio Electronics...
The LM143 integrated circuit is a high voltage operational amplifier from National Semiconductor that is...
We found this circuit in the November 1985 issue of Radio Electronics magazine. It uses TTL...