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

Posted: Mon Aug 09, 2021 7:19 am
by Andrew
Yes, the buzz would most likely be the reg dropping out.

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

Posted: Mon Aug 09, 2021 9:24 am
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.

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

Posted: Mon Aug 09, 2021 12:38 pm
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!

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

Posted: Wed Aug 11, 2021 11:17 am
by Ray P
Received some additional PCBs from Andrew today. They'll probably go into a Bartola 3A5 preamp.... ...one day!

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

Posted: Wed Aug 11, 2021 3:08 pm
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.

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

Posted: Wed Aug 11, 2021 6:44 pm
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!

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

Posted: Wed Aug 11, 2021 8:49 pm
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 :)

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

Posted: Wed Aug 11, 2021 9:11 pm
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. :)

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

Posted: Mon Sep 20, 2021 4:54 pm
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

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

Posted: Mon Sep 20, 2021 6:44 pm
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 :)

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

Posted: Mon Sep 20, 2021 10:00 pm
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

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

Posted: Mon Sep 20, 2021 10:23 pm
by Nick
Post a few more messages and you will be fine to PM

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

Posted: Tue Sep 21, 2021 4:43 pm
by malarkey1976
OK, I'll do.