Bike speedometer (CB20497E)

This circuit can be powered by a solar cell. The circuit is from a 1991 documentation having a phototransistor as sensor.

Ultra Miniaturized FM Transmitter (CB14873E)
If mounted with SMD components, this transmitter will be so small that it can be installed inside a...
Summing Amplifier (CB14101E)
The output voltage of this circuit is the sum of the input voltages. The circuit is from the 1994...
Oscillator triggered by light (CB20355E)
This Hartley oscillator uses an audio output transformer that can be obtained from small, unused...