Linear Amplitude Modulator (CB21087E)

Found in an Analog Devices documentation from the 90s, this circuit uses a component of the time, not common nowadays.

Compressor LS150 (CB15196E)
This “compandor” circuit has the opposite effect of CB15195E. The LS150 is not common today and...
Xenon strobe light (CB9108E)
This circuit was obtained from an American documentation from the 1980s. The T1 triggering...
Turntable Amplifier LM380 (CB14165E)
This circuit is suggested by the Linear Applications Handbook of National Semiconductor, being used...