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

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Andrew
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#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.
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Nick
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#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.
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Ray P
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#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!
Sorry, I couldn't resist!
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Ray P
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#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!
Sorry, I couldn't resist!
RhythMick
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#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.
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Ray P
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#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!
Sorry, I couldn't resist!
Andrew
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#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.
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Ali Tait
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#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
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#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
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#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
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#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
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Nick
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#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
Whenever an honest man discovers that he's mistaken, he will either cease to be mistaken or he will cease to be honest.
malarkey1976
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#1183 Re: DHT Heater using VCCS - PCB or Kit (Possible Group buy)

Post by malarkey1976 »

OK, I'll do.
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