We found this circuit in the May 1983 issue of Radio Electronics magazine. The integrated circuits are from that time. Note the supply voltage.
This circuit triggers a low consumption buzzer when the LDR remains illuminated for more than the...
This filter has a cut-off frequency of 1 kHz by letting pass those that are above this value. The...
This circuit is from a 1991 publication. It divides the frequency of a TTL signal applied to its...