Salas hotrodded blue DCB1 build - Page 222 - diyAudio
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Old 29th September 2012, 11:36 PM   #2211
Salas is offline Salas  Greece
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Before, in that case.
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Old 2nd October 2012, 11:09 PM   #2212
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Well, plugged it in and smoked one of the large capacitors. now to figure out why.
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Old 3rd October 2012, 03:19 AM   #2213
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Check and double checked. Smoked one of the the 4700 mf capacitors..so my problem is on that side. Where do i start besides looking for more burnt stuff on that side?
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Old 3rd October 2012, 03:29 AM   #2214
Salas is offline Salas  Greece
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See if your diodes are populated in the right orientation following the printed stripes for cathode on pcb, see if any one of them is charred also. Disconnect the trafo and see with the meter in ACV mode that the wires you sent to the outer terminals of the AC in pcb connector are the expected secondary sum value. Also that each one measures half that in respect to the wire(s) you sent to connector's middle point.
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Old 3rd October 2012, 03:37 AM   #2215
Salas is offline Salas  Greece
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P.S. If you had used TO-220 big diodes, their backs face outwards along the pcb's edge is the orientation.
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Old 3rd October 2012, 08:13 AM   #2216
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Always a finger on electrolyts when starting up . If some is getting hot turn off. You HAVE done something wrong.
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Old 3rd October 2012, 08:39 AM   #2217
atupi is offline atupi  Romania
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I'm using 10R and across them i have 1.87 and 1,92 V respectively. If i want to go beyond 200mA level i need just to lower this resistors or i need to to something else to increase the voltage across them ?
My voltages are almost equal between the two rails.
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Old 3rd October 2012, 11:55 AM   #2218
Salas is offline Salas  Greece
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Something else would mean more leds which aren't available on the pcb so the way is to lower your resistors value.
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Old 6th October 2012, 09:07 PM   #2219
jeff517 is offline jeff517  United States
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I remember reading on here that the graphic was reversed on the leds. Or maybe some other thread. I used the squared holes and refrence when putting in leds.
As for Transf, 12v on all output side.
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Old 6th October 2012, 09:18 PM   #2220
Salas is offline Salas  Greece
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Square hole is Led's anode in this pcb as crt designated that half circle symbol over the 5 Led groups, when its the cathode in the 3 Led groups. If you put just one in reverse they will not shine, but no reason to blow a reservoir cap. In fact its the first time I hear someone blows a reservoir cap. Could it be it was reversed for polarity by accidental insertion or just very unlucky to chance on a dodgy one?
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