1,5V Thermometer (CB21280E)

We found this circuit in old documentation from National Semiconductor. The circuit makes use of a sensor from the time.

Variable Power Supply (CB16345E)
We found this circuit in a 1982 publication. This source allows an adjustment of the output...
1 kHz Active Band Pass Filter RC4558 (CB19782E)
This circuit uses two Raytheon RC4558 operational amplifiers that are similar to the 741. The...
5 V Suqare Calibrator (CB5348E)
This circuit was found in the National component manual which is not currently simple to obtain....