Battery and Alternator Monitor (CB26311E)

This automotive grade circuit was found in a 1991 Electronics Hobbyist. The transistors are general purpose types. P1 sets the monitoring voltage.

| Clique na imagem para ampliar |

Telephone in use warning button (CB9465E)
This circuit was found in a Hands On Electronics from the 90s. It turns on an LED to indicate that...
Micro Alarm (CB1512E )
-- We find this configuration very simple in a previous American publication of 1973. The...
16 kV voltage source (CB6931E)
This circuit consists of an inverter powered by only 4.5 V. The circuit is from a 1967 Mullard...