In the technical literature describes blocks for power supply from the mains electro-mechanical clock-alarm clocks. Units, galvanic replacement element 1.5 V, contain the rectifier with the voltage regulator and the dividing step-down transformer. Stabilizer eliminates voltage dips power if the load increases at the moment of switching signal electroacoustic Converter (bell, buzzer electric). The dividing step-down transformer is required under the terms of technique electrical safety.
I believe that to power the electro-mechanical hours without signal electroacoustic Converter, elektrozvonka or buzzer unit power supply can be simplified. Due to the negligible consumption current hours may apply a symmetric transformerless circuits (see figure) with decreasing capacitors C1 and C2 are very small capacity (0,033 UF 200 V type HMD-2), which make Elektroprivreda going to watch safe. What is not in [1,2].
Stabilization in the block may not be available watch without elektrozvonka or buzzer, and the voltage variations in the mains insignificant and does not have a significant impact on accuracy. Except this, periods of increase and decrease of voltage mains length time approximately equal, what causes vsekommentarii slow the course hours the acceleration and Vice versa.
Capacitors C1, C3 and resistor R1 (1K type sun-0,125 W) can be placed in a special plug that is included in the socket, and the diodes and the capacitor C2 (470 µf 6.3 V type K50-24) - dimensional case, plug-in compartment watches instead of galvanic cells. Possible other options. Required the voltage at the output of the block is achieved by clarifying the resistance value of resistor R1 included in hours and normal voltage at the input. Diodes type CCA. I have used the scheme D1A.
When the power supply device, which consumes a relatively large current, galvanic element 373 eventually stops working due to the relatively the increased internal resistance. Granted voltage begins almost entirely fall on this resistance. If such an element to use for power electronic mechanical watches, consuming pulses of relatively small current, it may still a long time to ensure their supply.
For this to set an item in the watch parallel to the contacts of its inclusion in the compartment of the power supply must be connected with the correct polarity small-sized oxide 100 UF capacitor with a working voltage of 6 V. This capacitor will eliminate the voltage drop element at the time of the peaks load. The location of the capacitor is arbitrary and depends on the size hours.
Literature
Author: A. Potteric. Artemovsk, Donetsk region.