We found this circuit in an 80s Intersil documentation. Modern equivalent operating systems can be used. The potentiometer adjusts the detection level.
Pressing S1 the LED glows by a time interval depending on the capacitor. Time intervals in the...
This overtone oscillator can generate signals up to 150 MHz. The crystal determines the frequency and...
Found in a 90's EDN, this circuit generates signals in the frequency range given by the graph. The...