Get regulated 6.3 VDC from 6.3VAC

[gerrittube]

Yes, wait and see. Your 5.6 mA without load is just below the minimum load, but you already got 6.3 V without load, so it seems to be OK.

Regards, Gerrit

 

[lcsaszar]

Update: AC voltage = 6.85V (it will supply the heater of the output tubes, maybe I will reduce it with a series resistor)
Average DC voltage on the puffer capacitors: around 8V (changing +/- 0.1V), ripple: 0.75Vpp
Stabilized voltage: 6.36V, no noise 🙂
Calculated dissipation: 2W (1.7V drop x 1.2A load current)

 

[gerrittube]

Hi Icsaszar,

I’m very happy you confirm my findings. Thanks for your updates!
What kind of cooling do you use?

Regards, Gerrit

 

[v4lve lover]

Ive posted 6 boards that i have left in the swapmeet, last parts will arrive by Friday.

https://www.diyaudio.com/community/...pplies-mic5156-based-tube-amp-upgrade.382265/

 

[lcsaszar]

What kind of cooling do you use?

This is a simple TO-220 heatsink screwed to the chassis. The regulator is isolated.

 

[gerrittube]

Hi Icsaszar,

Your cooling looks more than adequate. I allways try to keep the leads to/from the chip as short as possible.
Have you insulated the chip or is it grounded with the screw?

Regards, Gerrit

 

[kodabmx]

Hi Icsaszar,

Your cooling looks more than adequate. I allways try to keep the leads to/from the chip as short as possible.
Have you insulated the chip or is it grounded with the screw?

Regards, Gerrit

This is a simple TO-220 heatsink screwed to the chassis. The regulator is isolated.

 

[lcsaszar]

🙂 It is difficult (for me) to differentiate between insulated and isolated. So I'd better do both 🙂