Differential voltage reference (CB8677E)

Using neon lamps, this circuit from a 1969 publication provides 17 V of maximum voltage or else adjustable.

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Modulated Oscillator (CB18237E)
This TTL circuit generates an 18 MHz signal modulated at 300 Hz. Its main use is as a test...
110 or 220V to 5V Power Supply (CB26064E)
This transformerless low-current power supply circuit was found in the August 1998 issue of...
Operational with FETs (CB14073E)
In the figure we have the way to obtain an operational amplifier with FETs at the input, using a...