CA3130 Overcurrent Indicator (CB22012E)

We found this circuit in an English publication from 1977. The circuit is suitable for 9 V loads but can be modified for other voltages.

High Input Impedance Stage (CB13397E)
We found this circuit in a 1977 National Semiconductor Databook. The circuit can use other FETs...
Variable Source 0 to 12 V x 1 A (CB12208E)
This circuit from the 80's can be easily implemented but needs some changes to avoid problems with...
4W x 500kHz transmitter (CB21803E)
We found this 4W transmitter in a Mullard transistor manual from 1960. The circuit is powered by...