The reference voltage for this circuit can be selected digitally. The circuit is from Radio Electronics dated February 1981. The 741 must be powered by a symmetrical source.
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...