MOSFET trigger (CB21480E)

This circuit was found in a 1967 Electronic Design. FETs are from the time, so modern equivalents can be used.

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Intercom Amplifier (CB6304E)
This circuit was found in a Ferranti documentation from 1969. The transistors are common types of...
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Twin-T Oscillator using the TL051 NE108 (MSB117E)
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