Vermona ER-9 first test

I recently got this ER-9 from an internet auction as broken - a resistor and a capacitor were fried according to the seller.

The schematics don't include the power supply, so if anyone also worked on this unit, could you please tell me the value of the resistor between the +12V and the +5V outputs? 82 Ohms seem to be a bit small, as the power transistor and resistor produce a lot of heat, 100 Ohms seem to be a bit too large as the 5V drops with this...

Besides the power supply, all D126D (7426) had some broken outputs each, so i replaced all of them. 2 Trimpots had some mechanical damage, besides this, the electronics were okay, just the electromechanical parts (start switch, volume knob, lamps) need some more work.

This machine has an interesting sound, i especially like the snare drum. There are lots of trimpots in the unit to tweak the sound and i don't have the adjustment documentation yet, so what you hear doesn't necessarily reflect the original sound of this machine, it's just what i adjusted.

Category:

Science & Technology

Tags:

• Vermona
• ER-9
• beatbox
• drums
• synthesizer
• repair
• DIY

[quadcam24v]

could you put up schematics, especially for the bass drum part of the machine?

Super machine btw!

[MusicMiK]

@quadcam24v What's so bad about using google to find the schematics? Ah, okay, it's simpler to ask others :)

YouTube doesn't allow links in comments, so you need to construct it on your own. Use the URL shortener named "bit" with TLD "ly". The path is hFaVcT

Good luck.

[mysteritmo]

Cool video and a great little machine. I like the sound. How much did you pay?

[MusicMiK]

@mysteritmo 32.09 EUR incl. S&H, add some EUR for spare parts and several hous to fix it :)

[MusicMiK]

@WeThink4U Still alive, but too busy for new videos. Lots of software development for the MonoMiK (and other projects), and things like display drivers, multitasking, memory management, mass storage handling, filesystems and all this stuff you implement when writing an own operating system just don't impress a lot in a video :)

It will take a while until the next videos appear, but i'm quite sure they will.

[wwwPepeMusicDE]

Nettes Maschinchen! Hübscher Sound!

[yumaddah]

Congratulations! You know, I really enjoy watching you play like a kid with your toys! Keep it up ;-)

[alphabeets]

Indeed is has a unique sound.

[Albinorama]

great one, lookin forward for more.