This circuit for RF measurements at 200 MHz was found in no documentation two years 80. At a sensitivity of 1V peak and the components used are still common in these days.
I found this circuit in a 1978 publication. The circuit can be assembled with a BD136 transistor to...
This basic TTL watch and minute clock circuit was found in European documentation from the 1970s....
This simple windscreen wiper interval was found in old American documentation. The relay must have...