Bandpass filter with two operational (CB20939E)

This circuit makes use of two transconductance operators. We found it in National Semiconductor documentation from the 1980s.

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Thermometer using aTransistor as Sensor (CB14021E)
We found this circuit in an old English documentation from the 70s. The transistor can be a modern...
Triangular and Square Generator LM3900 (CB14194E)
We find the circuit below in the 1994 Linear Applications Handbook by National Semiconductor. The...
G7L x Power Relays PCB (COM186E)
January 2017 - Omron G7L-x relays for PCB mounting can now be purchased from Mouser Electronics. These...