Turning on low-voltage electrolytic capacitors. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Reference materials
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It often happens that a radio amateur does not have a filtering electrolytic capacitor with the required operating voltage at his disposal. In this case, you can use the scheme shown in the figure.
The circuit does not require special explanations, but when choosing a zener diode VD1, it should be borne in mind that the stabilization voltage of VD1 should not exceed the voltage of the power source; the sum of the stabilization voltage VD1 and the rated voltage of the capacitor C1 must be greater than the voltage of the power source by an amount exceeding the possible changes in the supply voltage (ripple, etc.); Zener diode VD1 must withstand the maximum charge (discharge) current of capacitor C1.
Zener diodes of the D1A - D815Zh type with a stabilization voltage of 815 to 5,6 V with a pulsed current of up to 18A [3] work well as VD1, which, in my opinion, is quite enough for most cases of practical application of this circuit.
The proposed circuit will work well for the charge, but for the discharge there will be a dip by the value of the stabilization voltage.
Literature:
- Semiconductor devices. Directory. - M.: Energoatomizdat, 1987
Author: Boris, St. Petersburg; Publication: N. Bolshakov, rf.atnn.ru
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