madbeanpedals::forum

Projects => General Questions => Requests => Topic started by: pickdropper on January 14, 2012, 04:46:46 AM

Title: EHX Micro Synth
Post by: pickdropper on January 14, 2012, 04:46:46 AM
I think it would be cool to do one of the old versions of this.
Title: Re: EHX Micro Synth
Post by: add4 on January 16, 2012, 02:01:35 PM
+1!
looks like a very hard project to layout :)
Title: Re: EHX Micro Synth
Post by: Scruffie on January 16, 2012, 04:07:00 PM
The original OTA chips it uses (CA3094/EH1048) are probably as hard to find as MN3005s and it uses a lot of them, it'd need converting to LM13700s first, I think this is one of the better to buy than build pedals.
Title: Re: EHX Micro Synth
Post by: LaceSensor on January 16, 2012, 05:44:39 PM
its been done on one of the other forums.
Title: Re: EHX Micro Synth
Post by: Scruffie on January 16, 2012, 06:04:44 PM
Oh yeah, there is a PCB layout isn't there.

Still, I wouldn't make it a fabbed bean project, at least in its current state.
Title: Re: EHX Micro Synth
Post by: jkokura on January 16, 2012, 06:06:30 PM
This falls in the 'only the true DIY geek would even think about it."

Truthfully, for the size of the enclosure, number of controls, complexity of build and rarity of parts, it's just not quite worth it. I've had a Micro Synth, and I think the newer version can be had for under 200 used. It's a cool pedal if you're into those sorts of sounds.

Jacob
Title: Re: EHX Micro Synth
Post by: LaceSensor on January 16, 2012, 09:27:32 PM
lets be frank its a fantastic effect but the demand for a project is no way worth the effort put into making it happen.

Likewise for other more complex effects, such as my beloved Lovetones. Most people happy with a simple phaser tremolo or flanger and thats just fine. Still, sucks if you are one of the minority that wants to see doable projects for these more esoteric / rare effects
Title: Re: EHX Micro Synth
Post by: Scruffie on January 16, 2012, 09:32:21 PM
Quote from: LaceSensor on January 16, 2012, 09:27:32 PM
Still, sucks if you are one of the minority that wants to see doable projects for these more esoteric / rare effects

...A/DA Harmony Synthesiser Project?  ???

(http://www.premierguitar.com/Stream/StreamImage.aspx?Image_ID=C31EB919-5AEE-4F37-8FE4-9761B526E88D&Image_Type=image)

;D
Title: Re: EHX Micro Synth
Post by: LaceSensor on January 16, 2012, 09:48:29 PM
fuuuuuu :)

Slightly O/T: If I run into a brick wall any chance youd be interested in helping me with my Doppelganger? You are in the UK, so I could in theory ship it to you...
Title: Re: EHX Micro Synth
Post by: add4 on January 16, 2012, 10:09:17 PM


...A/DA Harmony Synthesiser Project?  ???

(http://www.premierguitar.com/Stream/StreamImage.aspx?Image_ID=C31EB919-5AEE-4F37-8FE4-9761B526E88D&Image_Type=image)

;D

... epic build!

p.s. Lacesensor, you ARE a lovetone addict... just saw you other poses on another forum :)
Title: Re: EHX Micro Synth
Post by: aziltz on January 17, 2012, 06:14:36 PM
is there a definitive schematic of the Micro Synth?
Title: Re: EHX Micro Synth
Post by: jkokura on January 17, 2012, 06:21:28 PM
From what I looked for Austin, I couldn't find one.

Jacob
Title: Re: EHX Micro Synth
Post by: Scruffie on January 17, 2012, 06:36:07 PM
I've got the original factory one and the re-issue factory one, not the re-re-issue though.
Title: Re: EHX Micro Synth
Post by: pickdropper on January 18, 2012, 12:04:11 AM
I wasn't able to find a definitive schematic, either.

Perhaps everybody is right and this is one just worth purchasing.  Looked like fun, though.
Title: Re: EHX Micro Synth
Post by: Scruffie on January 18, 2012, 12:49:30 AM
Quote from: pickdropper on January 18, 2012, 12:04:11 AM
I wasn't able to find a definitive schematic, either.

Perhaps everybody is right and this is one just worth purchasing.  Looked like fun, though.
When I said I had factory ones, I meant schematics, I have the proper ones.

This one is worth purchasing, but perhaps some form of simplified workalike could be fun.
Title: Re: EHX Micro Synth
Post by: jkokura on January 18, 2012, 01:00:23 AM
The part of the circuit that's always really interested me is the Filter section anyway. The Octave stuff is cool, but I use a POG for that now and it's a bit better at I think.

More rare, and certainly more cool than the microsynth is the Bass version I think. I'd love to have one of those.

Jacob
Title: Re: EHX Micro Synth
Post by: LaceSensor on January 18, 2012, 02:06:09 AM
Quote from: jkokura on January 18, 2012, 01:00:23 AM
The part of the circuit that's always really interested me is the Filter section anyway. The Octave stuff is cool, but I use a POG for that now and it's a bit better at I think.

More rare, and certainly more cool than the microsynth is the Bass version I think. I'd love to have one of those.

Jacob

Dont quote me but its apparently only a small number of part subs to convert either to the other
Title: Re: EHX Micro Synth
Post by: Scruffie on January 18, 2012, 02:16:45 AM
Quote from: LaceSensor on January 18, 2012, 02:06:09 AM
Quote from: jkokura on January 18, 2012, 01:00:23 AM
The part of the circuit that's always really interested me is the Filter section anyway. The Octave stuff is cool, but I use a POG for that now and it's a bit better at I think.

More rare, and certainly more cool than the microsynth is the Bass version I think. I'd love to have one of those.

Jacob

Dont quote me but its apparently only a small number of part subs to convert either to the other
Yup, i'll quote you  :P

That's correct to the best of my knowledge.
Title: Re: EHX Micro Synth
Post by: the3secondrule on January 18, 2012, 08:11:09 PM
I've done the mod - and can confirm it is a s simple as 4 parts. the bass version seems to track better on guitar too.

I'll have to dig up my notes, i found the mod on another forum, but the part numbering was different between the bass synth schem, and the micro synth PCB, so it did take a little bit of tracing.

I also modded my synth for true bypass, and wired the power LED as an indicator for bypass / effect

J
Title: Re: EHX Micro Synth
Post by: the3secondrule on January 18, 2012, 08:37:18 PM
here you go:
http://www.freestompboxes.org/viewtopic.php?f=13&t=7502&hilit=micro+synth&start=40#p119399 (http://www.freestompboxes.org/viewtopic.php?f=13&t=7502&hilit=micro+synth&start=40#p119399)

"There seems to be some incorrect information around ...
According to the factory schematic, the following parts need to be changed for the bass-version:
C6=2u2 (1u)
C7=1u (0.47u)
C8=0.1u (0.056u)
R62=12k (2k2)"

got the schem around here somewhere as well...