12V x 700mA Regulator (CB8807E)

This small regulator was found in a Motorola 1968’s documentation. It is a current regulator using transistors of the time.

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Up to 500 kHz Pulse Generator (CB13452E)
This circuit was found in an old documentation and can be implemented with BC549 transistors. The...
AM Receiver (CB21558E)
This mid-waveband receiver was found in a book on transistors from 1954. The antenna coil is of...
Micro Inverter for 23V Multimeter (CB15853E)
Old multimeters used a 22.5 V battery for high resistance measurements. If you have one, you...