This simple bridge circuit can be used for impedance or resistance measurement using a high impedance earphone as an indicator. The circuit is from an American 80's documentation.
This circuit, found on Motorola's Linear Interface ICs uses the MC1536 as a driver for a 36 W or...
This circuit was obtained in a 1977 Radio Handbook. The transistor is from the era and the coils...
We found this HV generator circuit in a 1967 publication. It can be fitted with SCR TIC106 and the...