| Electronics > Repair |
| Help finding an similicar IC to repair old panasonic camcorder |
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| wraper:
I'm not sure if they're actually necessary for this circuit but you could add 4x 1N4148. |
| inse:
It appears to be a buck converter, that linear IC doing the control and the transistor array the power switch followed by an LC filter. So you will definitely need the diode for the freewheeling phase. Try to isolate the 9V line transistor by interrupting B and C to check whether the other transistors still work. Also use a multimeter to measure the freewheeling diodes whether they are standard or shottky diodes. If other transistors work, you could try to measure the beta to narrow down the candidates for replacement. Most probably you will have to go for SMD parts to fit it on the camcorder PCB Edit: thinking about it, probably the freewheeling diode plus transistor have failed, then the IC can‘t be saved. Thinking of the space constraints in a camcorder, I would estimate the chances to fix it without the original spare part rather low. 🙁 Darlington arrays like UDN2891 are no alternative as the switching speed is too low |
| wraper:
--- Quote from: inse on January 06, 2025, 05:35:44 am ---Most probably you will have to go for SMD parts to fit it on the camcorder PCB --- End quote --- IMHO it's easier to put TH parts into existing holes + common wires for emitters and anodes. With SMD you'll need adapter board. |
| yaya1956:
My ideia is to recreat the circuit in a small board gluing the transistors and the diodes an them solder to the existing pins. with smd parts things get a lot harder i think. the space inside the camcorder its not that smal. |
| inse:
Whatever fits, fits. Some questions still to be answered before |
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