Search found 4093 matches

by Andrew
Wed Dec 25, 2019 11:29 am
Forum: Assorted Stuff
Topic: Merry Christmas Everybody
Replies: 18
Views: 1026

Re: Merry Christmas Everybody

Merry Humbug.
by Andrew
Sun Sep 29, 2019 6:12 pm
Forum: Everyones Projects
Topic: We are delighted to announce ...
Replies: 21
Views: 1954

Re: We are delighted to announce ...

All working ok now, dare I ask?
by Andrew
Mon Aug 26, 2019 10:35 pm
Forum: Everyones Projects
Topic: DHT Heater using VCCS - PCB or Kit (Possible Group buy)
Replies: 1102
Views: 131104

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

Also check the 470k resistors and the 470nF caps.
by Andrew
Mon Aug 12, 2019 9:40 am
Forum: Everyones Projects
Topic: DHT Heater using VCCS - PCB or Kit (Possible Group buy)
Replies: 1102
Views: 131104

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

I can get some boards done. I was hoping there might be a few takers to help cover costs, you need to order a decent amount to make it worthwhile. SMPS would work fine on the smaller PCB, but you might get HF artifacts breaking thru. Nevertheless, as long as the heatsink can cope, which it should do...
by Andrew
Sun Jul 21, 2019 6:57 pm
Forum: Everyones Projects
Topic: GM70 PP
Replies: 151
Views: 11587

Re: GM70 PP

Nick wrote:
Sat Jul 13, 2019 4:59 pm
I have argued that a centre tap with DC will help reduce any residual noise. But I think it practice its not worth doing and may be worst as you are adding extra resistors in the circuit.
I could be late to the party here, but I would agree with Nick..(didn't a politician once say that?) ;)
by Andrew
Wed Jul 10, 2019 7:55 am
Forum: Everyones Projects
Topic: DHT Heater using VCCS - PCB or Kit (Possible Group buy)
Replies: 1102
Views: 131104

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

Hopefully, but I am not immune from parts shortages either.
by Andrew
Tue Jul 02, 2019 11:26 am
Forum: Everyones Projects
Topic: Inverted OTL with 6SN7/6AS7
Replies: 120
Views: 13313

Re: Inverted OTL with 6SN7/6AS7

What does you noise floor look like with just the measuring system (loopback more) and then with the amp in the loop? Then you/we can compare. Well, sort of no. That will show you how much noise in dB that the amp is producing, but without knowing what the noise floor of the measuring kit is all yo...
by Andrew
Mon Jul 01, 2019 9:39 am
Forum: Everyones Projects
Topic: Inverted OTL with 6SN7/6AS7
Replies: 120
Views: 13313

Re: Inverted OTL with 6SN7/6AS7

Wolfgang, I agree with Nick, in fact we had a chat about this over the weekend at a quiet point in a show we were doing... 1) To see the interesting stuff you need a log scale on the x-axis or, if you can't do that, zoom in more or 20Hz-1kHz 2) We need a baseline to compare your relative measurement...
by Andrew
Sun Jun 30, 2019 11:49 pm
Forum: Everyones Projects
Topic: DHT Heater using VCCS - PCB or Kit (Possible Group buy)
Replies: 1102
Views: 131104

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

RhythMick wrote:
Sun Jun 30, 2019 6:51 pm
In case I haven't said Andrew, I think these boards are superb. Excellent job, thanks.

Between Geoff and I we have 24 of these in use and more to come.
Thanks :)
by Andrew
Sun Jun 30, 2019 1:51 pm
Forum: Everyones Projects
Topic: DHT Heater using VCCS - PCB or Kit (Possible Group buy)
Replies: 1102
Views: 131104

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

izzy wizzy wrote:
Sun Jun 30, 2019 12:04 pm
Hi Andrew.

Is there a possibility of the larger board being available in future? What is the primary difference between the lathe and small board? I would like 4 of the larger one if possible at some point.

Cheers,
Stephen
If there's a bit of demand, I'll get some done. Anymore for any more?
by Andrew
Sun Jun 30, 2019 1:50 pm
Forum: Everyones Projects
Topic: DHT Heater using VCCS - PCB or Kit (Possible Group buy)
Replies: 1102
Views: 131104

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

RhythMick wrote:
Sat Jun 29, 2019 4:40 pm
Andrew can I take another 6 of the small boards please?

If you have components spare (especially the smd caps) let me know, but happy to just take 6 of the boards if you have them.
Sure, I'll drop you a pm, Mick
by Andrew
Fri Jun 21, 2019 11:44 am
Forum: Stacks
Topic: DHT Heater Group Buy notes.
Replies: 35
Views: 13834

Re: DHT Heater Group Buy notes.

Yep, Nick's suggestion should be fine :)
by Andrew
Mon Jun 17, 2019 11:30 am
Forum: Stacks
Topic: DHT Heater Group Buy notes.
Replies: 35
Views: 13834

Re: DHT Heater Group Buy notes.

I should add that I have not had any reports of the non-epoxy cap breaking on the PCBs in the field. Doesn't mean it hasn't happended but I've not heard about it....if it has.
by Andrew
Mon Jun 17, 2019 11:13 am
Forum: Stacks
Topic: DHT Heater Group Buy notes.
Replies: 35
Views: 13834

Re: DHT Heater Group Buy notes.

Those caps in standard form can can become fractured due to expansion and contraction; basically the "ends" fall off under the heat. The epxoy version was created for environments where this fracturing was percieved to be a problem. When I subbed the non expoy for the epoxy one, thinking they'd be t...
by Andrew
Mon Jun 03, 2019 10:03 am
Forum: Assorted Stuff
Topic: Attendees Owston 1/2 June 19
Replies: 188
Views: 25197

Re: Attendees Owston 1/2 June 19

Thanks to Steve for organising, and thanks to everyone else who made it the best Owston for quite some time :)

I really enjoyed the day, it flew past.