Memory of a miner's lamp. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Memory of a miner's lamp. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Chargers, batteries, galvanic cells

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This charger is designed to charge batteries up to 10 Ah.

The "heart" of the device is an integrated voltage regulator DA1 and transistors VT1 and VT2, which form a current generator. The current is set by resistors R3 and R4. Switch SA1 can change the amount of current (1 or 0,08 A). With the indicated position of SA1, a current of 1 A is set, which is charging (0,1 of the capacity), and 0,08 A is recharging for a 10 Ah battery. VT3 and VT4, together with HL2 and HL3, form the indication circuits of the corresponding mode.

(click to enlarge)

Details. Diodes - KD202 or any other medium power. Instead of KT817, you can install KT815, KT604; instead of KT805A - KT805AM, BM or any other p-p-p powerful transistors.

Transformer - any with a secondary winding of 15 ... 18 V, rated for a current of 2 ... 4 A. VT2 must be installed on a radiator.

Establishment. Instead of a battery, an ammeter is connected to the GB1 terminals and R1 and R2 are selected until the desired current value is obtained.

Author: I.Sagidov, Shchara village, Dagestan

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a guest
"Instead of a battery, an ammeter is connected to the GB1 terminals and R1 and R2 are selected until the desired current value is obtained" Probably these are resistors R3 and R4.

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