Home › Forums › Vintage EHX › EH-0300 Vocoder rackmount (Thoughts, Manual, + Mini Synth request)

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  • July 5, 2009 at 8:51 am #78535
    EH-8000
    Member

    this thing looks soooo cool
    it is not v.flexible at all imho, you have to tweak it just so, if you want clarity
    also, MANY synth carrier signals just don’t work too well with it compared to every other vocoder i have tried
    but when you tweak it just so, and you use just the right kind of carrier signal, it is capable of sounding up there with EMS Vocoder 5000 and Senheiser Vocoder, I really think, retro future dreams.

    PLEASE does anyone have a manual for it, very interested to see what it says
    (or for the vintage mini-synthesizer either, for that matter, I just have one sheet of preset sound settings for it)

    ps: dron.de talks about the vocoder, mentioning auto ‘pause stuffing’ – wtf?!?

    July 5, 2009 at 9:52 am #98906
    DiscoFreq
    Participant

    I have one too, and schematics, but no manual.

    Quote:
    ps: dron.de talks about the vocoder, mentioning auto ‘pause stuffing’ – wtf?!?

    I didn’t have the time to play a lot with it, so I don’t know if the EH Vocoder has this, but in general this could mean that the synth sound comes through when there’s no voice. Normally there would be no sound at all when there’s a pause in the voice signal.

    July 5, 2009 at 11:51 am #98907
    EH-8000
    Member

    http://syntezatory.prv.pl/ has a couple of sample demos of the eh vocoder the solo one is imho just about the best you can get from it,
    his website is awesome by the way, as are his youtube videos, i love the 800dv and jx3p ones especially

    July 5, 2009 at 1:13 pm #98909
    DiscoFreq
    Participant

    Nice …

    Btw, I just received a lot of EHX schematics and there are some for the Vocoder as well (at least the filter part, not sure about the rest).

    February 14, 2011 at 4:54 pm #114290
    ClockworkRobot
    Participant
    Quote:
    Nice …

    Btw, I just received a lot of EHX schematics and there are some for the Vocoder as well (at least the filter part, not sure about the rest).

    OH, Hi, I’m a newby to the forum. Just joined to try and score these exact schematics (for a faulty Electro-Harmonix Vocoder EH-0300 I just acquired)

    I posted more details in a new thread…I should maybe have looked harder for this one first, sorry. Feel free to merge them if anyone can.

    Anyway you’d make me a very happy solder monkey if you’d share the schematics with me?
    Thanks.

    February 14, 2011 at 5:04 pm #114291
    DiscoFreq
    Participant

    I made scans, but I have to look on my PC at home, remind me if I forget :)

    February 15, 2011 at 11:50 pm #114332
    ClockworkRobot
    Participant
    Quote:
    I made scans, but I have to look on my PC at home, remind me if I forget :)

    Brilliant. Thanks.

    I had a quick look at it last night. The power supply appears OK (the power LED was blown, that’s all) I was surprised the thing only appears to run on +DC power. All the other vocoders, like most synth gear I’ve looked at appear to have a +15 / GND / -15volts or similar layout.

    It still just makes the buzzing sounds and since the yellow ‘level’ led never responds to an instrument it must be something before the vocoder section that’s causing the problem.
    I’ll probably shotgun all the transistors first then start socketing and replacing the amp chips.

    But those schematics should save me a lot of guess work.

    February 17, 2011 at 6:35 pm #114355
    DiscoFreq
    Participant

    I added the schematics to my page for the Vocoder:
    http://www.effectsdatabase.com/model/eh/vocoder

    March 17, 2011 at 5:10 am #114678
    ClockworkRobot
    Participant

    HANKYOU thankyou Thany You for posting those schematics. My vocoder LIVES!

    BOY was it gubbed though.

    Had intermittent power problems and the thing just made a buzzing sound. I replaced lots of transistors and a few of the op-amps. This killed the annoying buzz but still no joy. Found the power was spiking all over the place and replaced the transformer with a temporary power supply.

    Got some odd behaviour out of the thing.. appeared to be working in ‘bypass’ mode only and the sound was still screwy. Added a whole bunch of extra ground wires to the sockets (possibly a problem as I have them out of the case and lying on the bench). Sound improved but was still stuck in bypass mode. Had a very close look at the wiring on the sockets.. oh someone’s been at this before and wired ’em up wrong! They have got the wire the is supposed to go to the bypass peddle connected to ground so it’s effectively permanently selected.. DOH!

    Fixed that and I believe I’m hearing vocoder like sounds :)

    YAY!
    Thanks Again!

    March 17, 2011 at 6:53 am #114679
    DiscoFreq
    Participant

    Good to hear that! I hope to use my vocoder a bit more soon :D

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