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Old 20th October 2021, 10:45 AM   #7201
goddlediddles is offline goddlediddles  Ireland
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Location: Kerry
Post your Solid State pics here.
Default Phono.

The ESP phono pre-amp.
Attached Images
File Type: jpg Horizontal 1.jpg (797.8 KB, 1065 views)
File Type: jpg PreAmp plus Motor-5 1.jpg (600.2 KB, 1002 views)
Always make up your own cables.
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Old 20th October 2021, 12:52 PM   #7202
AudioSan is offline AudioSan  Norway
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Join Date: Feb 2009
Originally Posted by crissir View Post
The audio multi-channel system that I made during the quarantine contains as following:
- 6 channels audio power amplifiers (250W ch/4 ohms (up to 3 channels driven) or 140W per ch/8hms for all channels driven) based on current dumping technique (from famous quad 405, actually a modified version including among the modifications usage of 4 transistors Sanken 2SC2922, OPA134)
- supply with 1000VA torroidal transformer with inrush current limitation with fail-safe function, 84600uF total cap area per 50V rail with inrush current limitation for charging and supply ok detection such that when the capacitors are almost at 80% charge the relays are bypassing the current limiters (less stress on toroidal transformer)
- overtemperature protection per every channel with sensor mounted between the power transistors, dc component speaker protection, overcurrent limitation per every channel (but this I removed :-))
- the entire protection module is galvanically isolated with and independent supply and voltage monitoring is done with help of optocouplers stages

I am happy with the sound and overall performance.
Now THAT is an ampbuild by my taste. No waist of space. Love it.
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Old 20th October 2021, 01:02 PM   #7203
crissir is offline crissir
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Join Date: Jan 2020
Thank you very much for your great feedback.

Best regards,
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Old 20th October 2021, 01:26 PM   #7204
doolybird is offline doolybird  Australia
diyAudio Member
Join Date: Aug 2016
Hi Paul

I got the vu meters fro jlmaudio. Unfortunately they are a real challenge to get working in my opinion. They are still not working consistently and I have now been advised it would be better to wire them to the outputs and not the inputs like I have...sigh...

When I get motivated I will pop it open and resolder to the outputs.



Originally Posted by paulba View Post
Hi doolybird,

I've started buying up parts for the Honey Badger Amp and was having trouble with finding a case for my project. Thanks for the info on the heatsinks, I'll give them a call tomorrow and organize pickup.

Where did you get the VU meters from?


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Old 20th November 2021, 04:20 PM   #7205
Samppaz is offline Samppaz  Finland
diyAudio Member
Join Date: Jul 2021
Location: Pori
Talking Now i have done it.

Somebody told me that buffer could be good idea before feed signal to my amplifier Gate pin.

So now i have made a new board to bias fet and there is a OpAmp to deliver the input audio signal with more power what the fets gate ever needs to maintain linearity every frequensy.

Picture maybe tell more then what i can write here.

I can tell that it was not easy task to make that board and keep the amplifier noise level down when there is not signal to present.

Finaly it get quite low noise when i made last change and that was separate main power cables somewhere else then side by side with signal and bias voltage cable.

I use microfone cable where outer shiel work as a ground and for that reason the connection with the dother board and the mains ground pin are together close to fet pin instead the star ground what everything else use.
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File Type: jpg IMG_20211120_175121__01.jpg (262.6 KB, 411 views)

Last edited by Samppaz; 20th November 2021 at 04:22 PM.
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Old 25th November 2021, 09:42 AM   #7206
Tarasque is offline Tarasque  Netherlands
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Join Date: Dec 2002
Location: Netherlands
Default Hawk A18 in operation

This is my testbed for the Hawk A18. I've build two of these; 1 for every ORION speaker.
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Old Yesterday, 12:21 PM   #7207
mihail is online now mihail  Ukraine
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Join Date: Jul 2009
Default Hiraga Le Monstre

My Hiraga 8W
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File Type: jpg IMG20211021082414.jpg (539.9 KB, 63 views)
File Type: jpg IMG20211021082925.jpg (627.9 KB, 59 views)
File Type: jpg IMG20211021083004.jpg (678.1 KB, 73 views)
File Type: jpg IMG20211021083944.jpg (981.1 KB, 66 views)
File Type: jpg IMG20211021084005.jpg (1,005.4 KB, 51 views)
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