This circuit for the VHF band of analog TV was found in Motorola documentation from the 70s. The integrated circuit used is uncommon today.
This bargraph VU meter with the LM3914 has an additional feature which is the peak indicator. In...
This circuit is from the SGS manual of linear integrated circuits of 1982. The L78xx is equivalent to...
This circuit was found in a 1968 documentation. It makes use of both NO and NC reed-switches and small...