An experimental module I made in 2013 based on a Douglas Self design. Douglas gave me some good advice at the time to help sort out the parasitics. The amplfier made me a big fan of CFP outputs and parallell output devices.
The idea of building ths was to get a continuous 100 Watts without a fan. I did run it with a 100 Watt sine wave into 4 Ohms for hours and the temperature leveled out at a pretty luke warm level. I plan to fire one up again and properly characterize it. I'm now quite curious what it will do. If I remember correctly the THD+N was about 0.0005% @ 1 kHz into 4 Ohms @ 150 Watts, but we shall see
The idea of building ths was to get a continuous 100 Watts without a fan. I did run it with a 100 Watt sine wave into 4 Ohms for hours and the temperature leveled out at a pretty luke warm level. I plan to fire one up again and properly characterize it. I'm now quite curious what it will do. If I remember correctly the THD+N was about 0.0005% @ 1 kHz into 4 Ohms @ 150 Watts, but we shall see
This is close to completion, hiraga 30w. Bias will be adjustable with 5 step rotary switch, from 1A to 1.6. I also bought analog meters that tells the dc offset so its easy to adjust, with changing bias.
I guess it's industrial look, no covers will be added, just the bottom plate.
The fan has a built in temperature regulator, so it's actually silent, I cant hear it at all, sensor is placed in a drilled hole
I guess it's industrial look, no covers will be added, just the bottom plate.
The fan has a built in temperature regulator, so it's actually silent, I cant hear it at all, sensor is placed in a drilled hole
Just thought I'd post some pics of some Hugh Dean Aksa "Maya Mk 4"monos I completed a few months ago. I used some old cases, the + and -ve power supplies are on the one board and quite compact so I could have used smaller cases. The cases are made out of aircraft grade aluminium.
The amps are laid out in mirror image format with the original idea being to keep the 240v and transformer away from the input signal leads.
Being "Plug and play modules" they were pretty easy to assemble, the transformers are 400va 45v.
I am very happy with these amps, more power than I'll ever need and IMO the best amps I have heard in my lounge/music room powering Vaf I93's.
The amps are laid out in mirror image format with the original idea being to keep the 240v and transformer away from the input signal leads.
Being "Plug and play modules" they were pretty easy to assemble, the transformers are 400va 45v.
I am very happy with these amps, more power than I'll ever need and IMO the best amps I have heard in my lounge/music room powering Vaf I93's.
Attachments
My DIY 100W + 100W Integrated Amplifier. Utilized STK4231 for power amp, LM1036 for tone controlling, and LA2615 for virtual surround sound. It also features a spectrum analyzer built using LM324 and KA2284.
Interested to find more details? : https://medium.com/@rasansmn/building-my-diy-stereo-amplifier-a-step-by-step-journey-ab43e0ab4e72
Always welcome any questions or comments you may have
Interested to find more details? : https://medium.com/@rasansmn/building-my-diy-stereo-amplifier-a-step-by-step-journey-ab43e0ab4e72
Always welcome any questions or comments you may have
So I got another one:
Here's my new little bugger, the «holy grail» by @lhquam !
This is a ZD25-Mini Power Amplifier is a simplified version of the ZD25, which was inspired by the Pass Labs XA25 Power Amplifier.
I just finished it after more or less 2 month building, twiddling, etc. to get an amp just as I thought I could do.
Softstart is handled by @Mark Johnson 's H9KPXG, PSU is a dual mono, with 2 x 2x18V 150VAC, 4 x 18000uF CapBank on ZM's HA!...
Heatsinks are @Gianluca 's Modushop, as well as the front- and back plate, perfectly cut and milled from a 5U-frontplate...
One of the reasons it took me so long was that I don't do CAD, so I had to rely on a drawing app to plan the layout, thus I was in a constant state of controlled improvisation, and a glitch led to the next little problem. And the heatsinks had to be "foldable" like an engine hood... (I hate to unscrew/screw a chassis / disconnet-reconnect the wiring etc.)
A big thank you to ihquam, Mark Johnson, Zen Mod, Nelson Pass, and the helping and encouraging folks who accompanied the process.
Ah, and the surroundings seem a little… messy. This is about to change, I've got a myself nice place to install a musical atelier
Here's my new little bugger, the «holy grail» by @lhquam !
This is a ZD25-Mini Power Amplifier is a simplified version of the ZD25, which was inspired by the Pass Labs XA25 Power Amplifier.
I just finished it after more or less 2 month building, twiddling, etc. to get an amp just as I thought I could do.
Softstart is handled by @Mark Johnson 's H9KPXG, PSU is a dual mono, with 2 x 2x18V 150VAC, 4 x 18000uF CapBank on ZM's HA!...
Heatsinks are @Gianluca 's Modushop, as well as the front- and back plate, perfectly cut and milled from a 5U-frontplate...
One of the reasons it took me so long was that I don't do CAD, so I had to rely on a drawing app to plan the layout, thus I was in a constant state of controlled improvisation, and a glitch led to the next little problem. And the heatsinks had to be "foldable" like an engine hood... (I hate to unscrew/screw a chassis / disconnet-reconnect the wiring etc.)
A big thank you to ihquam, Mark Johnson, Zen Mod, Nelson Pass, and the helping and encouraging folks who accompanied the process.
Ah, and the surroundings seem a little… messy. This is about to change, I've got a myself nice place to install a musical atelier
Attachments
Excellent work @myleftear ! I particularly like the vertical arrangement and also your outline diagram showing the design topography.
Best,
Anand.
Best,
Anand.
Mooly's MMADFM monoblock build
Full build can be found here:
https://www.diyaudio.com/community/threads/moolys-mmamfm-monoblocks-a-build-log.409422/
Full build can be found here:
https://www.diyaudio.com/community/threads/moolys-mmamfm-monoblocks-a-build-log.409422/
Looks good, David, especially for a first effort! Clean layout. Internal wiring can be challenging. There are trades to be made between performance, assembly/maintainability, and appearance. One of the members has some excellent articles about wiring power amplifiers on his website at hifisonix.com. His focus is performance.