The purpose of this circuit is only to increase the input resistance of a multimeter, since there is no voltage gain. The batteries are 9 V and operational equivalents can be used.
Using NTCs or LDRs as sensors, the frequency of this circuit depends on the temperature or the...
This oscillator works with voltages from 1 V of alternative energy sources, such as a battery of...
We have here an ultra-simple amplifier stage of just one transistor, which can have some uses on...