Greater Toronto Area DIY meetup

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#461
My built is much simpler, a single opamp based preamp. I called it "an active volume attenuator", just to contrast my passive TVC. The very simple design consists of the input signal goes through a volume pot and enters the opamp that has a standard two resistors feedback path with a bypass cap. The gain is quite low, about 4 times. I have been doing some opamp rolling and it was fun (and cheap). The most expensive part was the transformer. I have tried JRC4502, LM4562, OPA2134 (and OPA2604 if I remember where I stored it). They all sound different. I am still waiting for the LME49720 from TI. I built a little wooden box using 1/8" birch for this little thing. Since I have not decided the opamp of choice, the box is currently being secured with rubber band😛.

I will bring it in and show you guys in the next get together.

Regards,
 
#467
DUG said:
I could probably make it.

Nothing new to show.

I could bring a smaller set of speakers to compare.
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Couple of problems for me. Long weekend is a non starter for me. Also, not sure I can host in this time. I might take a pass this time and come back in the new year.

Definitely planning on attending Taves this year so that kind of soaks up my free pass for this Qtr.
 
#468
wlowes said:
Couple of problems for me. Long weekend is a non starter for me. Also, not sure I can host in this time. I might take a pass this time and come back in the new year.

Definitely planning on attending Taves this year so that kind of soaks up my free pass for this Qtr.
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Walter,

No problem. May be next time.

I also planned to attend the TAVES in November. As usual, I probably go on Friday - much less crowded. Make sure you grab one of thoses discount coupon in Canada HIFI.

Regards,
 
#472
I'm going to the TAVES show on Friday.

My next project is building the Audio Note Kits L1 EL84 integrated amplifier.

Brian Smith of Audio Note Kits will have a dedicated room to demo his tube gear with cables provided by Steve Huang of Audio Sensibility.

I'm looking forward to hearing this combination.
 
#475
Walter, hopefully I will see you there.

I prefer to go to TAVES on Friday - a lot less people and one can spend more time in each room and do some listening. The down side is that most of the seminars and/or "big demos" usually take place on Saturday and Sunday.

Since SVS decided to participate in the show this year, we probably will see Mark (he came to the last 2 getherings at Walter's office), who is the product development director of SVS.

Look like the discount coupon for the show is finally out - one has to bought the ticket on line and pck it up at the entrance though.

Regards,
 
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