Hi Simon If it's of any use, here is the original circuit in rough. I mention it because It shows the relay that allows the hpa to sit between the dac and the power amp. With the hpa switched off the signal is routed directly from the dac to the power amp. when the hpa is switched on the relay route...
I've built a number of power supplies like the one shown, at least I think I have. This one doesn't work. The rail voltages are as shown on the diagram. The Tx is 2 x15v. it's supposed to supply + and - 12v but the negative rail comes out at -20v ish. At first I thought I'd got a dodgy 7912 so I bou...
Hi Simon I’m a bit slow, I didn’t realise the questions might still be outstanding. C2 and C3 are the blocking caps because it’s single ended and there is a voltage on the FET source. R8 is the output load and in the spice diagram it represents the headphones. As Nick has pointed out, it is a buffer...
Why use ECX10N20? Because it "sounds good"? Is suited to the task? It looks like it's "audio grade" but now obsolete - is it likely to be superior to say IRF510? not obsolete.... https://www.profusionplc.com/parts/ecx10n20 yes, very much superior to irf510 IMO current builds I'm...
Why use ECX10N20? Because it "sounds good"? Is suited to the task? It looks like it's "audio grade" but now obsolete - is it likely to be superior to say IRF510? not obsolete.... https://www.profusionplc.com/parts/ecx10n20 yes, very much superior to irf510 IMO current builds I'm...
A couple of things came to mind after your last post. Do you want a headphone amp or do you want to experiment more with valves or do you insist on designing/ building a headphone amplifier. There doesn’t have to be, but there is a distinction. Your post reminded me of the simple latfet hpa that I p...
I was going to do ours last summer but the price of the teak slats put me off...cheapskate as usual...
Sandrine was sitting on it this afternoon but suggested that I didn't risk it...the cheek of it.
I have had a web domain registered with freeparking for nearly 25 years. In fact I have 2 domains with them at the moment. In late 2022 freeparking changed it’s name to namesco.co. Every year my 12 monthly renewal has increased but this year seemed a bit excessive. I have just renewed Sandrine’s dom...
been taking a trip down memory lane...back in 1973 everybody thought I'd lost it when I kept raving about these guys...not sure if most of the members are the same but for sure David Surkamp is...
a bit more.... I don't like tapping blind holes, I have tried and failed in the past...so my M.O over the last 20 years has been to drill through heatsinks between the fins and attach circuit boards to the sinks with nuts and bolts and spacers. this build was slightly different because I had the pcb...
No burning/melting? that was what surpriised me the most. it cuts about the same pressure as 6mm ply and leaves a bit of feather edge which is easy to rub off with a file or emery block. I was fully expecting it to clog the band and get sticky, but not a bit of it......perfectly clean cut. I've ela...