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

What people are working on at the moment
Andrew
Eternally single
Posts: 4119
Joined: Thu May 24, 2007 2:18 pm

#1171 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)

Post by Andrew »

Yes, the buzz would most likely be the reg dropping out.
Analogue, the lost world that lies between 0 and 1.
User avatar
Nick
Site Admin
Posts: 13662
Joined: Sun May 06, 2007 10:20 am
Location: West Yorkshire

#1172 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)

Post by Nick »

Yes, if you look at the output on a scope what you see in those conditions are fast low going spikes in the output. Its why checking with a meter doesn't give the full picture as the RMS value of the output will be about the same.
Little known fact, coherent thought can destructively interfere with itself leaving no thought at all, that’s why I prefer incoherent thought.
User avatar
Ray P
Eternally single
Posts: 4973
Joined: Thu Nov 22, 2007 5:18 pm
Location: Somerset

#1173 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)

Post by Ray P »

Unfortunately I don't have an o'scope but it was obvious when listening that something was awry.

I keep thinking about buying an oscilloscope but always seem to find something else to spend my money on!
User avatar
Ray P
Eternally single
Posts: 4973
Joined: Thu Nov 22, 2007 5:18 pm
Location: Somerset

#1174 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)

Post by Ray P »

Received some additional PCBs from Andrew today. They'll probably go into a Bartola 3A5 preamp.... ...one day!
RhythMick
Old Hand
Posts: 718
Joined: Fri Jun 23, 2017 12:24 pm

#1175 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)

Post by RhythMick »

I built 8 in a marathon session at the weekend. I found the production line method to work better. Do the smd cassia on all boards, do the cc resistors, etc.
User avatar
Ray P
Eternally single
Posts: 4973
Joined: Thu Nov 22, 2007 5:18 pm
Location: Somerset

#1176 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)

Post by Ray P »

RhythMick wrote: Wed Aug 11, 2021 3:08 pm I found the production line method to work...
I adopted the same approach when I had eight to assemble for the 300B OTL project!
Andrew
Eternally single
Posts: 4119
Joined: Thu May 24, 2007 2:18 pm

#1177 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)

Post by Andrew »

Ray P wrote: Wed Aug 11, 2021 11:17 am Received some additional PCBs from Andrew today. They'll probably go into a Bartola 3A5 preamp.... ...one day!
Good news they made it ok :)
Analogue, the lost world that lies between 0 and 1.
User avatar
Ali Tait
Eternally single
Posts: 4152
Joined: Fri Jun 08, 2007 8:10 pm
Location: Galashiels

#1178 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)

Post by Ali Tait »

Ray P wrote: Wed Aug 11, 2021 6:44 pm
RhythMick wrote: Wed Aug 11, 2021 3:08 pm I found the production line method to work...
I adopted the same approach when I had eight to assemble for the 300B OTL project!
Me too. :)
malarkey1976
New User
Posts: 4
Joined: Fri Feb 05, 2021 10:55 pm

#1179 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)

Post by malarkey1976 »

Hello Andrew,

I would like to buy 2xsmall and 2xlarge boards. If you still have some available, could you send me a PM, please?

Thanks
Kai
Andrew
Eternally single
Posts: 4119
Joined: Thu May 24, 2007 2:18 pm

#1180 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)

Post by Andrew »

malarkey1976 wrote: Mon Sep 20, 2021 4:54 pm Hello Andrew,

I would like to buy 2xsmall and 2xlarge boards. If you still have some available, could you send me a PM, please?

Thanks
Kai
No problems, are you ok waiting for a week, or two, Kai? I'll put them by for you.

Send me a PM for details :)
Analogue, the lost world that lies between 0 and 1.
malarkey1976
New User
Posts: 4
Joined: Fri Feb 05, 2021 10:55 pm

#1181 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)

Post by malarkey1976 »

It's no problem for me to wait. Please send me a PM when the boards are ready to ship or for further details. I'm new to this forum, so I'm not able to initiate a conversation via PM.

Thanks
User avatar
Nick
Site Admin
Posts: 13662
Joined: Sun May 06, 2007 10:20 am
Location: West Yorkshire

#1182 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)

Post by Nick »

Post a few more messages and you will be fine to PM
Little known fact, coherent thought can destructively interfere with itself leaving no thought at all, that’s why I prefer incoherent thought.
malarkey1976
New User
Posts: 4
Joined: Fri Feb 05, 2021 10:55 pm

#1183 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)

Post by malarkey1976 »

OK, I'll do.
Post Reply