Crystal Pierce Oscillator (CB6149E)

This circuit uses a 100 kHz crystal, but nearby frequencies can be obtained with appropriate crystals. Components are still common today.

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Small 2-Transistors Radio (CB18844E)
We found this transistorized radio for the AM band in a Japanese publication from 1960. The...
4.1 V x 35 mA Power Supply (CB13206E)
This small source is suitable for low consumption equipment that uses batteries. The circuit is...
10-minute timer 555 (CB9368E)
Found in a magazine 73 for radio amateurs, this circuit has two settings, one for the interval and the...