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α24 with M³ preamp built log&Q's

alpha24 (preamp/buffer, voltage DAC analog output stage, balanced ↔ unbalanced converter)

Re: α24 with M³ preamp built log&Q's

Postby amb » February 21st, 2020, 12:49 pm

Nice work!
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Re: α24 with M³ preamp built log&Q's

Postby Pieterh » February 27th, 2020, 10:27 am

So, lets continue with the tactile switch which goes on the opposite side of the front panel. I needed one to operate the menu of the preamp. However, before choosing a specific tactile switch, I had to find a switch cap that looks similar in color, material and size to the Cliff CL 12345 jack in my previous post (because I want the front panel to be as symmetrical as possible). So I was lucky enough to find one after days of searching the internet :shock: .

I ended up with this one from Digikey: TAGBLK, no. EG1091-ND, it is 8,80mm dia. x 10,50mm H. So its height is enough to cross the 10 mm modushop front panels and more importantly, the cap diameter of 8.8 mm (together with some manoeuvring space of 0.2 mm) matches the drill hole size of 9.0 mm needed for the Cliff jack. What else........?

With the cap specifications, I found this matching tactile switch: TL1100F160Q, it is 12mm size and can be bought at digikey (no. EG1821-ND). The construction of the switch on the front panel with a small prototype pcb is straight forward. The standoffs are m3 / 5.0 mm. The pcb has 2.54 mm hole pitch.

Menu switch 1.jpg

Menu switch 2.jpg

Menu switch 3.jpg
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Re: α24 with M³ preamp built log&Q's

Postby Pieterh » February 27th, 2020, 10:31 am

Menu switch 4.jpg

Menu switch 5.jpg
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Re: α24 with M³ preamp built log&Q's

Postby Pieterh » February 27th, 2020, 10:39 am

Both the switch cap and the jack extend about 0.2 mm outside the front panel. That is symmetrical enough.

Menu switch 6.jpg
Jack 7.jpg
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Re: α24 with M³ preamp built log&Q's

Postby amb » February 27th, 2020, 12:54 pm

Excellent! Great attention to detail.
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Re: α24 with M³ preamp built log&Q's

Postby Pieterh » March 22nd, 2020, 9:15 am

There is some progress. I inserted the plexy glass window in front of the display unit I have bought. The plexy glass is 3mm thick.

Plexy glass window inserted.jpg


I have used an edge of 2mm.

How a 2mm edge looks like.jpg


And here we see the display unit installed. Just beside the display unit I glued the IR receiver (not on the photo's). I used some bitumen to block any light from the back. Simple and easy.

Display unit.jpg
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