This simple logic level tester was found in Radio Electronics from the 90s. The inverters are of the 4009 type and the power comes from the circuit being analyzed.
May 2016 - Mouser Electronics is sourcing the new high-performance audio amplifiers with bipolar...
The figure shows how to implement the AND function with a Norton LM3900 operational amplifier. The number of...
This circuit allows you to read resistors up to 20 M ohms, converting it into voltage. The circuit is...