The LED frequency flashes depends on the value of the capacitor tested according to the table. We found this circuit in a Popular Electronics from the 80s.
This circuit is from a 1991 publication. The integrated circuit used is an integrated radio from...
The circuit we showed was obtained from our publication on relays and makes use of any...
This symmetrical four voltage source was found in a 1968 Motorola documentation. The circuit is of a...