1,5V Thermometer (CB21280E)

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

Varicap in the Tuning Circuit (CB4102E)
The figure shows how to use a varicap in a conventional tuning circuit. The circuit may be an...
Multiple Experimental Bridge (CB23674E)
This bridge circuit for the bench can have several uses. We found it in Radio Electronics magazine...
Voltage Controlled Oscillator (CB4168E)
This VCO with a common operational amplifier was found in an old American documentation. The...