This resistance meter was found in an English documentation from 1989. The operational amplifier admits an equivalent and the transistor can be a BC558 or BC559.
Found in older Signetics documentation, this circuit generates signals from 30 Hz to 25 kHz....
This circuit trips a relay when it stops receiving a signal. The transistor is germanium. We found...
This standing wave alarm (SWR) warns when a high SWR value may mean an overload for the...