Bipolar voltage from ordinary. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Bipolar voltage from ordinary. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Voltage converters, rectifiers, inverters

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When designing various AF power amplifiers, radio amateurs often face the problem of the lack of a bipolar power source. The circuit shown in Fig. 1 allows you to get a bipolar supply from an ordinary power supply, in addition, it is a stabilizer in itself. Both AC and DC voltage can be applied to the input, in the latter case, the VD1-VD4 diodes can be excluded, but the polarity will have to be observed when connecting.

Bipolar voltage from ordinary
Ris.1

Consider the operation of the device. If you look closely, the circuit consists of three simple voltage stabilizers. When connected to a power source, +2 V is supplied to the VT27 collector, a stabilized +12 V is removed from its emitter relative to the minus, therefore, the voltage difference between the VT2 collector and emitter is 15 V.

It is this voltage that VT1 uses, on its emitter, relative to the emitter VT2, it is also stabilized +12 V, and relative to the minus, the voltage is +24 V. Everything seems to be fine, they figured it out, got a "plus", "common" and "minus" and no the need to use a negative stabilizer on VT3. However, imagine a situation where the output of the upper arm according to the scheme is short-circuited, then the VT2 emitter will be closed with the VT1 emitter, +24 V will be on the common wire relative to the minus, in other words, on the lower arm of the relative "common" arm according to the scheme, it will be -24 V. This can lead to the destruction of the supply equipment. To prevent this from happening, a minus stabilizer, assembled on VT3, is installed.

Bipolar voltage from ordinary
Ris.2

Construction and details. All parts of the stabilizer, except for transistors, are mounted on a printed circuit board made of a single-layer foil textolite 35x95 mm in size. The transistors are "planted" on duralumin heat sinks and connected to the printed circuit board with stranded wire segments. Capacitor and resistor values can be changed by 20-25%. The printed circuit board is shown in Figure 2. If all the details are in good order, a properly assembled circuit does not need to be adjusted and starts working immediately.

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