Low battery indicator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Chargers, batteries, galvanic cells
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As you know, the life of a 9-volt nickel-cadmium battery will be shortened if it is discharged below 7 volts.
On fig. 7.11 shows the electrical circuit diagram of the battery voltage indicator 7D-0,1.
When the power is turned on, the charge current of the capacitor C1 passes through the tunnel diode VD1. In this case, the voltage across the diode VD1 is sufficient for the transistor VT1 to open. The HL1 LED, included in its collector circuit, is lit.
The emitter current of the transistor VT2 creates a voltage on the resistor R1 that closes the transistor VT1, as a result of which the current does not pass through the HL2 LED. When the voltage on the battery drops below 7 V, the voltage across the tunnel diode and resistor R2 sharply decreases abruptly, the transistor VT1 closes, the HL1 LED goes out, and HL2 starts to glow, signaling the need to charge the battery.
Author: Semyan A.P.
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