#1 DC Voltage Reg PCB Group Buy Notes
Posted: Sun Jun 23, 2013 1:51 pm
I promise this for several folk, including Neal who purchased some spare PCB off me at Owston.
If using the specified parts, insulation washers and tabs on the heatsink are not required.
For 6.3v use a 9v AC TX operation R5 = 120R, R6+R7 = 560R + 68R (ish) depends upon the reg and Darlington used.
For 12.6v operation, if you have the kit, you need to up-rate the input cap to something like 6800uF @ 25v, watch out for the part's diameter. A 25mm diameter cap is a very tight squeeze and obtaining a 10,000uF at 25v at 22mm is quite a challenge, however 6800uF 25v 22mm is fine. R6 + R7 should be 1.2k + 56R (ish). At a minimum a 12v AC TX should be fine.
As always watch out for cap polarity when stuffing the PCB. The Tantalum cap is marked, but typically on a small Tant with the writing towards you, the positive is on the right.
Andrew
If using the specified parts, insulation washers and tabs on the heatsink are not required.
For 6.3v use a 9v AC TX operation R5 = 120R, R6+R7 = 560R + 68R (ish) depends upon the reg and Darlington used.
For 12.6v operation, if you have the kit, you need to up-rate the input cap to something like 6800uF @ 25v, watch out for the part's diameter. A 25mm diameter cap is a very tight squeeze and obtaining a 10,000uF at 25v at 22mm is quite a challenge, however 6800uF 25v 22mm is fine. R6 + R7 should be 1.2k + 56R (ish). At a minimum a 12v AC TX should be fine.
As always watch out for cap polarity when stuffing the PCB. The Tantalum cap is marked, but typically on a small Tant with the writing towards you, the positive is on the right.
Code: Select all
Part Farnell Rapid Notes
STMICROELECTRONICS - LD1085P TO220F 1 1087151 0
SK 129 50,8 1 1319813 0
TIP122 , NPN, 100V, 5A, TO-220FP 1 1084454 0
2kbp02 2a 200v In-line Bridge s203l 0 1 47-0902
470nf 63v Mks2 Min Poly Capacitor 5mm 0 3 10-2224 Bend Legs to fit or find 10m part
4700uf 16v 7.5mm pitch 16mm dia 0 1 11-3746
10uf 35v 5mm Tantalum 5mm pitch 0 1 11-1022
10000uF 16v 22mm dia 10mm pitch 0 1 11-2990 No longer stocked
1N4001 0 1 47-3130