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Old 21st October 2019, 01:39 AM   #1231
kct is offline kct  Canada
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Join Date: Dec 2006
Location: KW, Ontario
Greater Toronto Area DIY meetup
I also wanted to mention ELAC's demo so as Gershman Acoustics sporting an Accuton mids also sounded very pleasant. Mike's innovative magnetic ton arm and MC pickup caught some attention and was well received at the show, so as the fine passive components by Solen. I was interested to find more information on the acoustic panels as pictured below but could not find any. Apparently the vendor was on site but I must have missed it. Does anyone have vendor info on that ?
The McIntosh Christmas tree decoration however could not have been missed by anyone.
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Distortion ? What Distortion ? --- Wires ? What wires ? --- Screws ? What screws ?
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Old 21st October 2019, 02:43 AM   #1232
wlowes is offline wlowes  Canada
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Agree. I think it was an enjoyable show. I hope they do it again next year. I like the way they spread it out so you were not hearing sound from the room next door.
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Old 8th November 2019, 01:12 AM   #1233
Lo_Tse is offline Lo_Tse  Canada
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It's been pretty quiet around here lately, how's everyone doing? Any new projects going on?
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Old 8th November 2019, 01:40 AM   #1234
anatech is online now anatech  Canada
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Just waiting for the next get together ...

-Chris
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Old 8th November 2019, 10:53 PM   #1235
rsavas is offline rsavas  Canada
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I am continuing with the Hafler DH-220C re-design and the BC-1 amp design that is in Bob Cordell 2nd edition book. Bob will be showing these at BAF this weekend.
DH-220C has been measured and tested. It performs almost the same as his prototype. We made a small OPS pcb that fits between the heatsink ears to make wiring to the fets much easier. It adds filtering and a zobel network. After that was done, I did another rev to this pcb so that it has the reverse voltage clamps and allows one to use this design in a DIYAudio HiFi2000 chassis and/or use plastic Exicon fets so anyone can build this amp.
The DH-220C front end pcb will need another rev as Bob found some high frequency gain peaking which is attributed to the way I ran the grounds on the pcb.

So Dave,
The pcb's I gave you will need a couple of pcb track cuts and wires to fix the grounding issue which is causing the hi freq gain peaking. I have pictures of that for you to follow along. I can give you a couple of these new DH-220C(OPS) pcbs for you to use in the modifications of your DH-220's. I have done the layout changes for DH-220C-A1, but need to get Bob's approval/review before I fab another set for testing. It is slow but we are making good progress.

Bob wrote to me last week.
Quote:
I had a chance to measure the DH-220C over the weekend with the OPS PWB installed. The OPS PWB appears to work fine, neither improving no degrading performance. That's good news.

Distortion is about right at 20 kHz with 8 ohm load, just a bit higher than that of my hand-wired prototype. I still need to look a little more closely at compensation vs distortion, but I think performance is just about there. THD-20 is just below 0.01% up to 100W into 8 ohms.

THD-1 is quite low and climbs to about 0.004% at 135W into 8 ohms. The amp clips at 162W into 8 ohms.

The amp THD-1 climbs to about 0.0025% at 200W into 4 ohms. The amp clips at 248W into 4 ohms
That's it for me, hopefully we will have something working for our next meeting. I am going to get a DH-200 chassis in exchange for doing a mod to another so I have one to try out and show.

Rick

Last edited by rsavas; 8th November 2019 at 10:56 PM.
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Old 9th November 2019, 02:11 AM   #1236
Lo_Tse is offline Lo_Tse  Canada
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Sounds interesting!! Looking forward to hear you amp in the next meet.

Regards,
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Old 11th November 2019, 02:00 AM   #1237
ticknpop is offline ticknpop  Canada
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Rick - I’m happy just to buy new boards when you have them ready.
I’ve held off doing much on the amp pending Bob’s review and updating.
Besides the Hafler rebuild I hoping to use Bob and Rick’s board in a Perreaux PMF 3500 rebuild with double die Exicon outputs with increased driver board heat-sinking and some resistor changes.

I haven’t done much building lately, been busy with work.
I also haven’t done anything about another DIY meet partly for the same reason, and thought you must all be tired of listening to the shop speakers and my medival musical taste

Last edited by ticknpop; 11th November 2019 at 02:05 AM.
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Old 11th November 2019, 02:21 AM   #1238
anatech is online now anatech  Canada
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Are you kidding? Everything is interesting and the members make these meetings a fun time. Although, not having much to show that you're working on is odd. I always look forward to seeing your next project.

Looking forward to saying hi to you Dave!

-Chris
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Old 11th November 2019, 02:43 AM   #1239
Lo_Tse is offline Lo_Tse  Canada
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Quote:
Originally Posted by ticknpop View Post
Rick - Iím happy just to buy new boards when you have them ready.
Iíve held off doing much on the amp pending Bobís review and updating.
Besides the Hafler rebuild I hoping to use Bob and Rickís board in a Perreaux PMF 3500 rebuild with double die Exicon outputs with increased driver board heat-sinking and some resistor changes.

I havenít done much building lately, been busy with work.
I also havenít done anything about another DIY meet partly for the same reason, and thought you must all be tired of listening to the shop speakers and my medival musical taste
Dave,

Honestly, I love the music that you played at the DIY meet. I guess we are in a similar age group and were exposed to the same genre of music when we were "younger" .

Regards,
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Old 11th November 2019, 03:07 AM   #1240
rsavas is offline rsavas  Canada
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Hi Dave,

The whole idea of making a DH-220C prototype and powering it up, measuring/testing etc, is to uncover issues, so that when we do a another DH-220C rev, hopefully we have these issues covered off.

Instead of listening to music exclusively, we could be doing some assembling/figuring/testing of the DH-220C design. We could be figuring out the mechanical aspects, of using the DH-220C front end in the Perreaux and Hafler chassis, lots of stuff to do.
I welcome Chris and others' experiences into making the DH-220C as best we can. It is DIYAudio after all.

I know you are busy with work but I can work around your schedule when you have the time.

Running the proto in the Perreaux PMF 3500 or using a +/-90V supply is a good test as to what is required, esp in the heatsink requirements, because the DH-220 design case would not be stressing it as much. It is possible that a special OPS pwb be designed for that implementation to make the wiring compact.Maybe what i came up with would do the trick. It is not that much different than what Bob is suggesting with the DH-220 re-design. No pressure, just throwing this out there for you to chew on.

Rick
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