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Transistor ringing current generator

2016-05-07 21:52  
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Transistor ringing current generator
Transistorringing current generatorchanges 24V DC into 60 ~ 90V AC ringing voltage for the supply of communications equipment, such as carrier, high-frequency terminals, wired telephone. 1. Technical performance (1) Input power: DC 24V ± 10%; (2) Rated output: 60 ~ 90V AC; (3) Frequency: 20Hz ± 5Hz; (4) Working conditions: temperature +5 ℃ ~ +40 ℃, ≤ 80% relative humidity environment, it can continuous work in 24 hours. 2. Choosing components: Cl, C2 use 1000μ/50V capacitor, C3 uses 200μ/50V capacitor, C4 is 10μ/150V capacitor. Resistor Rl is 200Ω, 1/2W, R2 is 1kΩ, lW, R3 is 3.6kΩ, 2W, R4 is 5.1kΩ, lW, R5 is 20kΩ, 1W, all of them are metal film resistors. Potentiometer RP is 33Ω, lW. Zener VDl is 2CW75, VD2 is 2CW73. Diode VD3, VD4 are 2CPl3. Transistor VTl is 3AD638, VT2, VT3 are 3AD30C. HL lights is XDX-24V, 0.5A, neon uses NH0-4C (60V, lmA). Power switch SA is KN3-3 (DPDT). Insurance FU is BGXP-1 2A fusion tube. Transformer T uses silicon material with core cross-sectional area in 38 × 45mm2. Nl, N4 are Φ0.25mm 39 high-strength magnet wires with winding turns, N2, N3 use enameled high strength Φ0.49mm with l89 turn, they are two-lane and winding. N5 uses enameled Φ0.35mm high strength wire with 840 turns.