My Q-Watt project

[calpe]

29th January 2021, very happy to report my Q-Watt has been and still is working 100%, used daily for at least 5 hours

 

[Kay Pirinha]

Are these Semelab power devices available again?


Best regards!

 

[calpe]

LME49811

As for the LME49811 being available again, you could look here

LME49811 – Buy LME49811 with free shipping on AliExpress

 

[Kay Pirinha]

Oh no, you don't seriously recommend us to buy delicate, probably obsolete semiconductors via Aliexpress, do you?


Best regards!

 

[calpe]

Q-Watt trouble free

I don't actually need them as i have a spare set.

For those that 'might' need them, you'll find them on the web page.

I was just commenting on the fact that my build has been working every day not saying anything about availability of the i.c.'s

 

[popchops]

Hi Guys!

I'm back on the project trail building a digital pre-amplifier for my Q-Watt, somewhat based on: https://sound-au.com/project163.htm

I'm looking for decent quality RCA panel-mount connectors, and I can't remember what I used on the Q-Watt.

Do you have any recommendations in the range 8-12 GBP per pair?

Pops.

 

[rsavas]

568-NYS367-2
568-NYS367-9

 

[calpe]

Pops, hows your QWatt? I have had mine on every day, since I finished it x years ago. I have an Elektor Preamp 2012 (there are a number of threads) connected to it, build at the same time as the QWatt, beautiful sound

 

[calpe]

Q Watt report. Working superbly every day since built!

 

[popchops]

Q Watt report. Working superbly every day since built!

Hello!! Nothing to report on Q-Watt. I've not needed to open it up for years. I do switch it off daily to save 25W idle power consumption, so the soft start is getting some exercise.

I am building a digital preamp and analogue switch based on PGA2311. 2-channel prototype is complete including software, and works brilliantly.

Uses optical encoder as volume control and infrared too. Offers 0.5dB steps in attenuation (or gain) with very low THD.

Am just now designing new circuit boards. I should start a new thread. Power supplies are both from ESP, and in fact the whole idea is based on ESP P163: https://www.sound-au.com/project163.htm.

Great to hear from you!

Popchops

 

[calpe]

Hi Popchops. Quite a build i see. Good luck on that!

I started on a Valve Amplifier by http://tubelab.com/designs/tubelab-spp/
I've got most of the parts minus the Transformer, that are stuck in the very very slow Spanish postal service.

 

[popchops]

First of 3 PCBs ordered today. Like your tranny, I expect to wait 5 weeks for this PCB to be delivered.
This 8-pin PIC will decode the quadrature inputs (and push button) from the Grayhill knob, and signal change and direction to the main PCB.

Pops.

 

[calpe]

June 2023 and i'm happy to report my Q-Watt is still sounding wonderful.