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

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RhythMick
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#1021 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)

Post by RhythMick »

When mounting the large boards to a chassis or copper sheet, what size of nylon support pillars should be used? I've been using 6mm and they work but just feels like there's tension between the transistors (which screw flat to the copper) & the board (which is held off by the 4 pillars).

Would 5mm be better?
Andrew
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#1022 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)

Post by Andrew »

Depends on how far the legs were thru the holes when you soldered the joints as to the best length to use. Its probably best not to stress the solder joints, if 6 is too big try filing some down a bit, if that works, try 5mm.
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pre65
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#1023 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)

Post by pre65 »

From memory I soldered the legs after the board had been fixed in position. Dummy run that is, without the heatsink compound.

I used 5mm thick nylon spacers.
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RhythMick
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#1024 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)

Post by RhythMick »

I have some boards from Andrew (thanks) and will be putting in an order soon for components (after I check what I have in stock).

Anyone need any of the components for the boards? I doubt there will be enough interest to make any price difference but you never know.
Max N
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#1025 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)

Post by Max N »

Hi Andrew.
This is probably a long shot - do you have any kits or boards still available?
Or does anyone have any that they want to sell?
Cheers
Max
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Ray P
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#1026 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)

Post by Ray P »

I think I have two of the 'large' PCBs that I can help you with if Andrew can't.
Sorry, I couldn't resist!
Max N
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#1027 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)

Post by Max N »

Thanks Ray
I’m actually after the standard ones at the moment. I can’t remember what the large ones are capable of, let me read back through the thread and see if I could use them elsewhere. I’ll get back to you ASAP.
Cheers
Max
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Ray P
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#1028 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)

Post by Ray P »

No problem Max. Physically the boards are about the same size; the 'large' one has extra filter caps and the active devices are mounted to a seperate chassis/heatsink whereas the standard board has onboard heatsinking.
Sorry, I couldn't resist!
RhythMick
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#1029 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)

Post by RhythMick »

Max N wrote: Sat Feb 02, 2019 4:33 pm Hi Andrew.
This is probably a long shot - do you have any kits or boards still available?
Or does anyone have any that they want to sell?
Cheers
Max
I have some waiting to be built, but I have plans for them I'm afraid.
Max N
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#1030 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)

Post by Max N »

RhythMick wrote: Sun Feb 03, 2019 10:44 am
Max N wrote: Sat Feb 02, 2019 4:33 pm Hi Andrew.
This is probably a long shot - do you have any kits or boards still available?
Or does anyone have any that they want to sell?
Cheers
Max
I have some waiting to be built, but I have plans for them I'm afraid.
OK, thanks anyway :)
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#1031 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)

Post by IslandPink »

Max N wrote: Sun Feb 03, 2019 9:33 am Thanks Ray
I’m actually after the standard ones at the moment. I can’t remember what the large ones are capable of, let me read back through the thread and see if I could use them elsewhere. I’ll get back to you ASAP.
Cheers
Max
Large ones will do 3A , maybe more if Andrew/Nick could advise. Small ones do max 1.5A .
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pre65
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#1032 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)

Post by pre65 »

IslandPink wrote: Sun Feb 03, 2019 11:58 am
Max N wrote: Sun Feb 03, 2019 9:33 am Thanks Ray
I’m actually after the standard ones at the moment. I can’t remember what the large ones are capable of, let me read back through the thread and see if I could use them elsewhere. I’ll get back to you ASAP.
Cheers
Max
Large ones will do 3A , maybe more if Andrew/Nick could advise. Small ones do max 1.5A .
Large ones do GK71 heaters (3 amp ish) but need a big heatsink.
The only thing necessary for the triumph of evil is for good men to do nothing.

Edmund Burke

G-Popz THE easy listening connoisseur. (Philip)
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#1033 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)

Post by Andrew »

Max N wrote: Sat Feb 02, 2019 4:33 pm Hi Andrew.
This is probably a long shot - do you have any kits or boards still available?
Or does anyone have any that they want to sell?
Cheers
Max
How many, Max? I have the so called "small" PCB in stock?

Andrew
Analogue, the lost world that lies between 0 and 1.
Max N
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#1034 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)

Post by Max N »

pre65 wrote: Sun Feb 03, 2019 12:01 pm
IslandPink wrote: Sun Feb 03, 2019 11:58 am
Max N wrote: Sun Feb 03, 2019 9:33 am Thanks Ray
I’m actually after the standard ones at the moment. I can’t remember what the large ones are capable of, let me read back through the thread and see if I could use them elsewhere. I’ll get back to you ASAP.
Cheers
Max
Large ones will do 3A , maybe more if Andrew/Nick could advise. Small ones do max 1.5A .
Large ones do GK71 heaters (3 amp ish) but need a big heatsink.
Thanks Phil & Mark
So the large will do a pair of 300b, a pair of 45s, a single 2A3, but not quite a 211.....
Max N
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#1035 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)

Post by Max N »

Sorry for all the questions......is the only difference between the boards the extra thermal capacity (large heatsink)
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