Telephone in use indicator (CB9467E)

We found this circuit in a Hands-On Electroncs from the 90s. The circuit uses an LED indicator. Diodes are general purpose types.

| Clique na imagem para ampliar |

TMP468 High Precision Temperature Sensor
April 2017 - Texas Instruments' new high-precision TMP468 sensor can now be obtained from Mouser...
Light alarm with LDR (CB24162E)
We found this circuit in the September 1971 Radio Electronics magazine. The SCR can be any of the...
AC125 Power Stage (CB4264E)
This 80's circuit uses germanium transistors like the AC125, AC151, AC163, 2N506 and others to...