UJT Flasher (CB6258E)

This unijunction transistor flasher or blinker was found in an old Popular Electronics. The frequency is given by R1 and C1 which can be changed.

Resistance to voltage converter (CB5092E)
We found this circuit in an American 80's documentation. The circuit can be adapted to function as a...
Voltmeter with FET (CB7361E)
Found in a 1964 Electronic Design, this circuit makes use of FETs of the time. These transistors can...
2 to 9 kHz PLL Synthesizer (CB4566E)
We found this circuit at Modern Electronics in January 1991. The magazine no longer exists, but...