Relay voltage stabilizer, 15-22/5 volts 10 amps. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Surge Protectors
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This stabilizer (Fig. 5.30) is designed to power digital devices. ICs that do not impose high requirements on the stability and level of output voltage ripple. The voltage stabilizer is equipped with protection against overcurrent and short circuits.
(click to enlarge)
The printed circuit board of the stabilizer is shown in fig. 5.31.
The main parameters:
- input voltage, V.....15...22;
- output voltage, V.....5;
- protection actuation current, A.....11;
- ripple level at the output, mV, no more than ..... 100;
- operating frequency, kHz.....20;
- load current (max), A.....10.
To obtain such a load current, a composite inclusion of several transistors was used, for better matching of which additional bias voltages are used, taken from rectifiers on diodes VD2, VD3. Resistor R4 is made of thick high-resistance wire wound on a ceramic case from a blown fuse.
Inductors L1, L3 are made of a piece of insulated mounting wire with a cross section of 1,5 ... 2 mm2, passed through four ferrite rings of the M2000NM1 brand, size K16x8x6 with a gap of 0,5 mm each. The L2 inductor is wound on a frame, which is installed in the B36 armor core made of M2000NM1 ferrite. The frame should be made collapsible so that after winding the coils it can be removed. The primary winding is wound with a "cord" of 20 wires of the PEV-1-0,4 mm type, and has 15 turns. The secondary winding consists of two sections; the first section has 6 turns of wire PEV-1-0,8 mm, the second - 2 turns of wire PEV-1-0,4 mm. The end of the first and the beginning of the second section are connected. The diagram shows the beginning of the first section.
After winding the coils, they are released from the frame and filled with epoxy resin. After mounting the coils in the core, a gap of 0,3 mm is set in it. The KT947A transistor can be replaced with KT935, KT912, the KD219 diode with KD213.
Author: Semyan A.P.
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Hearing needs constant training to stay in shape, and those who live in constant silence are as deafened as workers in a forge and press shop.
German researchers came to this conclusion. A group of physiologists led by Gerald Fleischer from the University of Giessen (Germany) measured the hearing acuity of more than 10 thousand people around the world over several years. At the same time, the noise level of their environment was also recorded.
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