Bipolar voltage shaper. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Power supply
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The circuit shown in the figure can be very useful when the TTL circuit has an analog circuit that draws a low but symmetrical bipolar voltage (such as an op-amp). Since current TTL systems usually only have a +5 V supply voltage, it is from this that a symmetrical supply voltage must be obtained.
In a transformerless converter, the G1 element serves as a rectangular pulse generator, with the specified values of R1 and C1, its frequency is approximately equal to 100 kHz, and the signal has TTL levels. G2 and G3 "buffer" two channels separately. Full-wave rectifiers are connected to the outputs of both buffers, the elements of which are connected in opposite polarities with respect to each other, so there are symmetrical voltages of 8,5 V with a permissible load of 10 mA at the outputs of the converter.
Given the relatively high frequency of the converter, for C2, C5 it is necessary to use, if possible, tantalum capacitors
Translation by A. Belsky; Publication: N. Bolshakov, rf.atnn.ru
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