Electronic absorb dome light circuit and maintenance circuit

Published:2011/3/30 21:22:00 Author:Jessie | Keyword: absorb dome light, maintenance | From:SeekIC

AC 220V rectified by the D1 ~ D4, C1, C2 filtering. C1 and C2 are series, can directly supply powertotubes to save charging capacitance, also reduced the compression requirements. R1 is startup resistance, provides BG2 forneeded initial voltage, R2 is bias resistors, BG1, BG2 and L1, L2, L3 compose theoscillating circuit, diodeD5 provides dischargecircuit for C3. L1 and L3 respectively connected to the bases of BG1 and BG2, which makes BG1 and BG2 get positive feedback voltageto initial. So that BG1 and BG2 turn in connected. High-frequency voltage formed in tubeto lighten it.



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