We found this circuit in a 1980s Motorola documentation. The circuit makes use of common operating and the voltage depends on the used type. The components are for a frequency of 500 Hz.
This filter with the operational 741 passes the frequency range between 300 Hz and 3,400 Hz. This...
Figure bellow shows how the 4088 or 4018 can be used as a touch switch. Two metal plates separated by 1 mm...
This circuit uses one of the first commercial transistors, availble in 1958, year of the...