555 zinc-manganese batteries reduction charger circuit

Circuit 555 as the core to form a astable multivibrator. Oscillation period T 0.693 (R1 + 2R2) C1 Icon parameter corresponding to the oscillation frequency of about 100Hz or so
555 zinc-manganese batteries reduction charger circuit - schematic

. Duty cycle is close to 1: 1 Therefore, the charger is charging pulse 555 output by R6 directly after the charging current limiting. D1 diode prevents battery discharge. DW for the regulator diode, when the battery is not fully charged, DW off, VT1 tube off, then reset terminal 555 was 4 feet high and 555 in oscillating state; when the battery is fully charged, DW conduction, VT1 saturated conduction tube pass, the 555 was 4 feet by leaving the low oscillation circuit suspension, automatic shutdown when the battery is full, at the same time, LED flashes, it indicates charged. DW should be selected so that the regulator Ratings plus 0.7V VT1 tube PN junction, the battery slightly higher than the nominal value. Thus, by selecting a different voltage source Vdd (5 ~ 15V) and different zener diode, to meet the different number of battery charging requirements. D4 is reverse battery indicator. R5, C3 composition smoothing circuit. The charge reduction is the use of pulse charging, zinc-manganese batteries for the resurrection of the reduction is good, but not used lead-acid batteries or rechargeable nickel-cadmium batteries.

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