3/29/2021 0 Comments Persamaan Transistor Pcr 406
A few IN4007 diodes, four q406 transistors (one for each output wire), and IC to do the sequencingfadingetc and a cap to smooth everything power wise since it runs directly at 240VAC (yes, nasty).Any help would be great as I cant put up the lights until I fix them.
Note that I have removed 1 transistor and 1 diode to get the info from them. Depending on the load current, somethiong like a BC548 would probably do. Just check the pinout - could be centre-collector or centre-base - collector probably connects to the LEDs. Looking at the PCB pic I;d guess centre base, so BC548 would be a good start. Good point - does the AC adapter output AC or DC AC would explain the presence of the diodes, and would point to them being SCRs or triacs. These circuits are normally powered directly from the mains without a step down transformer. To complicate things the SCRs could be switching unfiltered DC so even if the DVM says its DC it doesnt necessarily mean theyre BJTs. I think this is the case here, given the datasshe and the diodes used to rectify the mains. It came from w ww.szhwct.comupfile2009715171018spec.pdf. Not sure about the trustworthiness of the website it came from, its all in Chinese or something. Coming from a Chinese website adds credibility in this case You know the key specs now, time to visit a component distributor. If you cant find it, go for the MCR100 which can be found in most component distributors (RS Components, Farnell and Digikey all stock it). Going from what youve said youre in a 240V area so you need the -6 (400V) version or higher. Hopefully I will have a christmas with lights I have found this on ebay ( ) MCR100-6 THYRISTOR MANUFACTURER ON SEMI 0.8A 400V TEMP RANGE -40c TO 110c TYPE TO-92 CASE Does that look suitable do you think Cheers all. I had a much closer look at the routing of the traces in the pictures. It appears that the light strings are powered from the output of the rectifier. However, the datasheet clearly states thats it is a bidirectional thyristor (top right), aka a TRIAC. To further complicate things, the company on the datasheet is: (use google translator) I could not find that part number in the SCR or Transistor ranges (they have them separate). Crazy. Are the lights LEDs. Each LED appears to be hand soldered along with a resistor with four groups of LEDs making up the 300. What I found did not look right so I am as confused as you It looks like a diode rectifier from 240vac, a cap for smoothing and the transistors as gates controlled of a misterious IC which is powered off the 240v through a resistor. I opened an LED controller that I have here (dont we all these days) and found it is using the PCR606 which is a SCR, from China again.
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