Signal amplifier for electronic wristwatches. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Clocks, timers, relays, load switches
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In some cases, in electronic wristwatches, the volume of the alarm signal or voice notification of the current time may not be sufficient. In this situation, the device offered to the attention of readers, which increases the volume of such signals, will help.
The device diagram is shown in the figure, its basis is an ultrasonic frequency converter on a specialized DA1 chip. The DC mode is determined by resistors R2 and R3, and the gain is determined by the ratio of resistors R5, R4 and is about 10. A dynamic head BA1 is connected to the output of the ultrasonic frequency converter, the signal volume can be adjusted by a variable resistor R1.
The device is connected to the wrist watch instead of or in parallel with the piezoelectric sound emitter. If the watch case is metal, a common wire of the device is connected to it.
The device uses MLT or similar resistors, a variable resistor - SP-1, SPO, SP4, capacitors C1, C4 - K10-17, oxide capacitors - K50-35 or imported. The TDA2030 microcircuit is interchangeable with the TDA2040, the dynamic head is any power of 0,5 ... 5 W with a voice coil with a resistance of 4 ... 8 Ohms, for example, 0.5GDSH-2, 2GDSH-16. You can also use a speaker system with appropriate impedance. The device must be powered from a stabilized source with an output voltage of 12 V, providing a load current of up to 0,5 A.
All parts, except for the dynamic head, are placed in a case of a suitable size using a surface mounting. A properly assembled device does not require adjustment.
Author: S.Irgaliev, Tashkent, Uzbekistan
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