This direct-coupled amplifier was found in Mullard's 1960s transistor manual. The transistors are germanium from the time.
The four gates of a 40111 IC are used in thes two-out circuit. The output chages their state in a...
This circuit is a digitally controlled variable capacitor. We found it in American documentation from...
This circuit was found in the January 1975 Radio Electronics magazine. The diodes are current...