Ice Warning on the Track (CB6046E)

We found this circuit in an 80's Radio Electronics. The circuit uses a PTC sensor and an LED indicator. The power comes from the car's own battery.

One diode full Wave Rectifier (CB4186E)
This interesting low current circuit uses only one diode to obtain a full wave rectified signal....
T521 High Voltage Polymer Capacitors
June 2017 - Kemet T521's new high voltage capacitors with capacitances up to 330 uF and voltages...
10 Step Indicator (CB4888E)
This 10-step voltage indicator was obtained from a 1980s publication. The circuit is based on an...