My first real large Amp build
Hi All,
I finally finished my Hiraga Super Class A build. Very happy with the sound and finished effort. Again, making the enclosure from raw materials took just as long as all the electronics. Really satisfying.
What should I build now ? I don'e need another amplifier but would be keen to build something Class A/B 100W or similar, open to suggestions. Wife will kill me.
Richard
Hi All,
I finally finished my Hiraga Super Class A build. Very happy with the sound and finished effort. Again, making the enclosure from raw materials took just as long as all the electronics. Really satisfying.
What should I build now ? I don'e need another amplifier but would be keen to build something Class A/B 100W or similar, open to suggestions. Wife will kill me.
Richard
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doolybird,
Splendid effort with built from scratch chassis. Those are Conrad heat-sinks you have installed?
What speakers are you using with the Hiraga Super Class A?
For Class AB, there are many good projects. I'll start with 3 (in no particular order), others can chime in:
- FH9HVX by XRK971
- FSSA2 by Fab
- VHEX+ by VZAudio
Splendid effort with built from scratch chassis. Those are Conrad heat-sinks you have installed?
What speakers are you using with the Hiraga Super Class A?
For Class AB, there are many good projects. I'll start with 3 (in no particular order), others can chime in:
- FH9HVX by XRK971
- FSSA2 by Fab
- VHEX+ by VZAudio
Thanks zman01
Yes, Conrad heatsinks as I am in Australia
I am using my NAD 7225PE as a pre-amp and I only have a set of Wharfedale Diamond 10.1's but the sound is very nice to my ears.
I will look at those A/B amps you suggest.
Cheers
Yes, Conrad heatsinks as I am in Australia
I am using my NAD 7225PE as a pre-amp and I only have a set of Wharfedale Diamond 10.1's but the sound is very nice to my ears.
I will look at those A/B amps you suggest.
Cheers
That's very nice! Is that cedar for the front and back? Very interesting choice of wood - must smell fantastic when the amp heats up! 🙂
Or is it poplar?
Or is it poplar?
I believe it’s Oregon or Douglas Fir. Two old boards covered in paint found under my fathers house.
100W with Chinese Quad 405 Boards.
Some time ago, I built this Quad 405-I copy from boards I bought from China, on eBay. The cabinet and heavy front aluminium panel were sourced on eBay too. It sounds as good as my own 405-I. I added an LS protection circuit, which I copied from my own one. It's still in service years later, with my nephew in France. He's thrilled with it.
Some time ago, I built this Quad 405-I copy from boards I bought from China, on eBay. The cabinet and heavy front aluminium panel were sourced on eBay too. It sounds as good as my own 405-I. I added an LS protection circuit, which I copied from my own one. It's still in service years later, with my nephew in France. He's thrilled with it.
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Power Conditioner for Quad Copy.
In my area, we have a lot of DC offset on the mains, especially around Christmas, when neighbours put up their flashing decorative lights. This causes the power tranny in the Quad copy to vibrate a little. It's very annoying, so I built this power conditioner to block it. The capacitors are 10,000μF, and the bridge rectifier is 30Amp. It works very well. It will handle up to 500 Watts.
In my area, we have a lot of DC offset on the mains, especially around Christmas, when neighbours put up their flashing decorative lights. This causes the power tranny in the Quad copy to vibrate a little. It's very annoying, so I built this power conditioner to block it. The capacitors are 10,000μF, and the bridge rectifier is 30Amp. It works very well. It will handle up to 500 Watts.
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You are not as silly as you look. Good build, very pro. It looks like a DC blocker. Good work.I see you have a variac in the background there. Good move.
I’m still going. You may need a bigger box but add a power EMI/RFI filter. I do and you should.
retro-thermionic: Mains DC blocker and RFI\EMI power filter
240V AC EMI Filter | Jaycar Electronics
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Isn't that one on the left under first IEC socket?
I really ought to make one. I'm living north of you in Clare. It is intermittent here, depending on what decrepit devices the farmers are using.
Fantastic photo in link. Was that in Ireland? It looks too neat!
6 channel power amp
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.
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.
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Yes, I see it. DC is on all mains these days. A blocker fixes that. Some think a power conditioner blocks DC. They don’t. One guy had a noisy power conditioner and inserted first in line one of my blockers. It fixed the humming conditioner by about 90%.
I really should have called it a DC Trap, because that's what it does - traps DC.
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?
Cheers
Paul