Chinese Hiland 0-30V/Audioguru PSU build (down the rabbit hole)

[bushtech]

Update time:
New transformer received:

 

[Audioguru]

I can "see" the weight of that powerful transformer.

 

[bushtech]

Yep, it's a little monster. Hope it doesn't tear a hole through my plastic case a la Fukushima!

 

[bushtech]

Update:
Diode D7 double up and reversal:

 

[bushtech]

Update:

Tricky insertion of Diode D13. Big thanks to Paulv here: Don't think I could have figured it out without his help http://www.paulvdiyblogs.net/2015/05/tuning-030v-dc-with-03a-psu-diy-kit.html

 

[bushtech]

Install of cap C10

 

[bushtech]

Update:

Installation of RV3:



Have I interpreted the wiring at the pot correctly?

 

[Audioguru]

Paul's schematic does not have RV3 so which schematic are you using?
Your long green wire for C10 is different to what Paul did.

 

[bushtech]

Audioguru: I am building to your Rev 6 design as per first post on this thread.

 

[bushtech]

Audioguru: Correct.
Paulv: C10 connects between D13 and Q3/R19
Your Rev 6: C10 connects between R19 and U3

 

[bushtech]

Install of RV2:

 

[Audioguru]

Your wires for RV2 are much too long and will act like antennas that might make the opamp pickup hum and other interference.

 

[bushtech]

Oooh! Thanks for that. Easy to fix. Does that not apply to Rv3?

 

[Audioguru]

I think that RV2 and RV3 should be mounted on the top or bottom if the board with very short wires or a new pcb should be used that has them included.

 

[bushtech]

Understood Thanks audioguru

 

[bushtech]

Update:

Progress on heatsink with 2 x 2N3055(insulated), BD139, LM7812, bridge rectifier and thermocouple for fan.

Crowded?? Nah!

Bridge rectifier is 6A 50V, bit on the low side, but all that I could get now.

 

[Audioguru]

I hope your heatsink has fins because usually the driver transistor and bridge rectifier have their own heatsinks.
I am glad that you are using a fan.

 

[bushtech]

Yes, would have liked a beefier one.

 

[Audioguru]

You might need a high power and noisy "leaf blower" to cool that little heatsink.

 

[bushtech]

lol. I am planning on doing a boxing a la car radiator. If it doesn't work I'll have to get a bigger one. Roughly how big should it be?

Thanks for your guidance. I am a babe in the woods here.