Universal voltage converter, 5 volts. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Voltage converters, rectifiers, inverters
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To obtain other voltages of various polarities from the supply voltage of TTL microcircuits (+5 V), you can use a converter, the circuit of which is shown in fig. 4.9. Its basis is a master oscillator based on logic elements DD1.1 and DD1.2, which generates pulses with a repetition frequency of about 10 kHz and a duty cycle of 2. Through the buffer elements DD1.3 and DD1.4, the pulse voltage is supplied to the key transistors VT1 and VT2.
Depending on the required voltage and its polarity, multiplier circuits (Fig. 4.10) with a positive or negative output voltage are connected to the collectors of these transistors.
The converter can use the K155LAZ chip, transistors of the KT502 (VT1), KT503 (VT2) series and diodes of the KD521, D220 series.
Author: Semyan A.P.
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