Search found 19 matches

by Ami
Wed Nov 28, 2018 10:15 pm
Forum: Beginners
Topic: information needed about low power amp topology
Replies: 46
Views: 1850

Re: information needed about low power amp topology

I maintain that your original circuit would have virtually no standing polarising charge and the capacitor wouldn't lead a very happy life Yes, I agree, but after you have finished moving those goalposts, this is what I was questioning: You will therefore realize that the capacitor will spend half ...
by Ami
Wed Nov 28, 2018 12:42 am
Forum: Beginners
Topic: information needed about low power amp topology
Replies: 46
Views: 1850

more on that capacitor!

I must admit that I'm still a little unsure about the magic that the inductor performs in this circuit, and intend to ask to use the schools oscilloscope to look at what's going on either side of the output capacitor. I have my dads old oscilloscope, but it has its own capacitor issues, so, I can't ...
by Ami
Mon Nov 26, 2018 9:48 pm
Forum: Beginners
Topic: information needed about low power amp topology
Replies: 46
Views: 1850

Simple adaptive/sliding bias amplifier.... finalized.

OK, I was so convinced that I'd found the best solution to the amplifiers requirements that I emailed Guru Norman the circuit. Here's what he said: ....well done on the diagram Ami, that's very neat, however, I must point out a couple of mistakes. Firstly, for your current application this will be a...
by Ami
Mon Nov 26, 2018 9:40 pm
Forum: Beginners
Topic: information needed about low power amp topology
Replies: 46
Views: 1850

Re: information needed about low power amp topology

shane wrote:
Mon Nov 26, 2018 4:29 pm
Not to mention the likes of Emerson and Wakeman who manage to satisfy thousands with an electric organ.







Be careful what you unleash, Amy.
I was just kidding really, I much prefer the oboe :oops:
by Ami
Mon Nov 26, 2018 1:48 am
Forum: Beginners
Topic: information needed about low power amp topology
Replies: 46
Views: 1850

Re: Thanks guys!

Well peeps, I built it and it works :D And it's all good! :P So good that to do it justice in listening tests I'm feeding it with a program of music from the line out on my CD player, (instead of the crappy MW tuner), driving a "vintage" 7" elliptical probably from an old TV set that is mounted in a...
by Ami
Fri Nov 23, 2018 11:59 pm
Forum: Beginners
Topic: information needed about low power amp topology
Replies: 46
Views: 1850

Project redux

....So peeps, I presented my work to Teach, in the sure and certain knowledge that I was going to be praised for not only being the first to finish the assignment, but also for the quality of my method exposition and practical skills. I was wrong. Very, very, wrong! :( My written work was criticised...
by Ami
Sat Sep 29, 2018 9:55 pm
Forum: Valves
Topic: PL36 Sweep Tube
Replies: 2
Views: 556

Re: PL36 Sweep Tube

Hi there. Dad built a self split class A P/P with two of those. It ran on quite low HT. He used this circuit as inspiration http://www.b-kainka.de/roehren/Schaltung4.gif full article http://www.b-kainka.de/roehren/gegentakt.htm. (in German) I have Dad's notebook with details of his version in but no...
by Ami
Sun Sep 23, 2018 4:51 pm
Forum: Beginners
Topic: information needed about low power amp topology
Replies: 46
Views: 1850

Thanks guys!

Hello peeps! Thanks to a member here, who knows who they are ;) I was kindly sent two transformers that were for a small push pull transistor amplifier. The driver one was the most suitable as the sound from the output one was noticeably muffled, teach saying because it was "not gapped core" (I will...
by Ami
Wed Sep 19, 2018 12:00 am
Forum: Beginners
Topic: information needed about low power amp topology
Replies: 46
Views: 1850

Re: information needed about low power amp topology

Mike H wrote:
Tue Sep 18, 2018 10:51 pm
Shame there aren't any values shown.
Mike.
Full article Radio & Electronic Constructor June 1973. http://www.spontaflex.free-online.co.uk/

Ami.
by Ami
Tue Sep 18, 2018 10:19 pm
Forum: Beginners
Topic: information needed about low power amp topology
Replies: 46
Views: 1850

Re: information needed about low power amp topology

http://www.spontaflex.free-online.co.uk/slidingjunior/circuit.jpg http://livinginthepast-audioweb.co.uk/imagex/misc/like-button2.jpg There's a gent on another forum who won't be pressing your button Mike! Here's what he says of the, "sliding junior" circuit by sir Douglas Hall..... It's actually hi...
by Ami
Tue Sep 18, 2018 8:45 pm
Forum: New Users
Topic: Hey there, I'm Ami!
Replies: 9
Views: 677

Re: Hey there, I'm Ami!

Ami there are some really good technical people on this forum who will go out of their way to help you, I know as being none technical (in electronics but still an Engineer in another field) I have had lots of advice and help, so good luck with your continued education. :) Thanks Andy, that's sweet...
by Ami
Mon Sep 17, 2018 7:55 pm
Forum: New Users
Topic: Hey there, I'm Ami!
Replies: 9
Views: 677

Re: Hey there, I'm Ami!

Refreshing to see a girl on any of the forums, welcome Ami enjoy your time here. Thanks Andy and all! People have already been so helpful, one day I hope to reciprocate, I find it odd that in my age group engineering interests is maybe 25% to 75% girls to boys but I've only noticed a few ladies on ...
by Ami
Mon Sep 17, 2018 12:01 pm
Forum: Beginners
Topic: information needed about low power amp topology
Replies: 46
Views: 1850

Re: information needed about low power amp topology

Thanks Nick. I've a lot to learn :P

Luv, Ami.
by Ami
Mon Sep 17, 2018 11:54 am
Forum: Beginners
Topic: information needed about low power amp topology
Replies: 46
Views: 1850

Re: information needed about low power amp topology

Looking on page 428 of this https://www.americanradiohistory.com/Archive-Radio-Constructor/70s/RC-1972-02.pdf Look like it was originally made by these http://www.repancobartlett.co.uk/index.html Maybe someone could email them and ask for specs for the TT56 Thanks Nick, I've sent an email to repanc...
by Ami
Sun Sep 16, 2018 9:13 pm
Forum: Beginners
Topic: information needed about low power amp topology
Replies: 46
Views: 1850

Re: information needed about low power amp topology

Hello everyone. You boys are the best! The circuit Nick posted is the one so I won't upload it again. If someone could find a transformer I could do payment in kind (with electronique junque that is, valves etc. :oops: ) pending apro from Mum, of course, or just buy it outright if the price wasn't t...