Clinical thermometer (CB7244E)

For measurements between 30 and 40º C this circuit was found in the documentation of 1968. The sensor is a difficult component to obtain today.

| Clique na imagem para ampliar |

12V Battery Charger LM350 (CB4845E)
This circuit consists of a constant current source for charging 12 V batteries. The charge is...
Neon Power Monitor (CB24103E)
This simple neon lamp power indicator circuit was found in the January 1971 Radio Electronics...
Harmonic Distortion Meter (Cb23613E)
We found this sophisticated meter circuit in an article in Radio Electronics magazine from June...