DHT Heater using VCCS - PCB or Kit (Possible Group buy)

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izzy wizzy
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#1186 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)

Unread post by izzy wizzy »

RhythMick wrote: Sun Sep 22, 2024 11:22 pm Could someone point me to the page/post which captures all the instructions for the boards please?

I'm going to use fixed resistors for the next boards and I can't recall the formula.

I think...

Vo = Vref * ( 1 + Ry/Rx)

But I can't recall what Vref is. I'm using the TLV431 on my boards, does that mean Vref is 1.24, vs 2.5 for the TL431?
Do you mean this?
https://www.audio-talk.co.uk/phpBB3/vie ... dht+heater

And yes, I think the TLV has 1.24V ref. I used them for 4P1L and 2P29L but I cheated and used a trimmer so maybe I didn't have to work anything out. Can't remember.

There's discussion on the TLV in that thread.
martin_jaeger
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#1187 Re: Gerbers/PCBs

Unread post by martin_jaeger »

Andrew wrote: Fri Jan 03, 2014 4:43 pm Gerbers for the 1.5A version are coming along.
Hi Andrew,
Are you still selling pcbs for the 1,5 A version? I'm searching for an upgraded filament supply for my 300b amp. Would the small version be adequate?
If you are not selling the boards anymore, would there be a chance of you sharing the gerber files for the board?
Thank you very much in advance for your most appreciated help.
Martin
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#1188 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)

Unread post by Andrew »

The smaller board, with the 'integral' heatsink, is perfect for 300Bs. Or, you can use the bigger board and mount onto a suitable part of the chassis of your build.

How many do you need?

PS The difference between the two designs is just the heatsink and mounts for two extra caps on the so-called bigger board, if you prefer to mount onto a chassis, for a 300B you could just leave off the two extra caps.
Analogue, the lost world that lies between 0 and 1.
martin_jaeger
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#1189 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)

Unread post by martin_jaeger »

Hi Andrew,

Thank you very much for your quick reply.
Two units would be what I am looking for.

Thank you very much in advance for your most appreciated help.

Best,
Martin
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#1190 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)

Unread post by Andrew »

I'll PM you, Martin.
Analogue, the lost world that lies between 0 and 1.
revintage
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#1191 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)

Unread post by revintage »

Hello Andrew,
Been away from building amps for about ten years. Now retired with more time to spend. Will build a few SE amps with 4P1L and 6B4G for my horn system. Ie will need a few regulator boards. Please mail info at lars(at)soderquist(.)se.
Cheers
Lars
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#1192 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)

Unread post by Andrew »

I'll send you a PM, initially, Lars
Analogue, the lost world that lies between 0 and 1.
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