It serves as a reference, since today we can have simpler and more compact solutions. This circuit is from an Electronics Experimenter Handbook from 1992. The integrated circuits are from that time.
This low-pass filter with 741 op and symmetrical source was found in the August 1993 issue of...
The duty cycle of a Schmitt Oscillator can be programmed by R1 and R2 in this circuit. The...
This circuit is used to test capacitors with a working voltage above 150 V, detecting shorts or...