Univox - Impersonator ( UEQ-375 )

Discussion regarding early stompbox technology: 1960-1975 Please keep discussion focused and contribute what info you have...
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MoreCowbell
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Post by MoreCowbell »

I found several refereb=nces to it, but no thread with the schematic...so HERE it is.

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<crap - I just saw that this was made in 1976, so if you could move it to the "post 1975 forum" I'd appreciate it AG>
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Univox - Impersonator  ( UEQ-375 ) schematic
Univox - Impersonator ( UEQ-375 ) schematic
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analogguru
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Post by analogguru »

Schematic contains mistakes....

This forum is ok for this unit.... The split is only approx. 1975 and more important is the split between the Boss/Ibanez/Dod (FET-switched) small-boxes stuff.

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Post by MoreCowbell »

analogguru wrote:Schematic contains mistakes....

This forum is ok for this unit.... The split is only approx. 1975 and more important is the split between the Boss/Ibanez/Dod (FET-switched) small-boxes stuff.

analogguru
OK, thanks.

I know this unit has been mentioned because of the inductor based EQ in, IIRC, the Fulltone GT500 thread among others.

May I inquire what the errors in the schematic are ? Just curious.

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Post by analogguru »

Have a look at the schematic below - can you find the difference ?

with the given component values the center frequencies of the filters are:
205 Hz, 430 Hz, 734 Hz and 3 kHz which seems to be reasonable.

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Post by MoreCowbell »

analogguru wrote:Have a look at the schematic below - can you find the difference ?
IC1B ground connection.

Oh, and the "Drawn by Per Cederholm 05-05-02" 8)

with the given component values the center frequencies of the filters are:
205 Hz, 430 Hz, 734 Hz and 3 kHz which seems to be reasonable.

analogguru

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Post by pinkjimiphoton »

sorry to bump a zombie back to life and all, but i just copped one of these on evilbay for a paltry sum.
dead on arrival. first suspect were the three electros. replaced 'em, 2x 10uF and 1 100uF. fired up with a squeal. solder bridge. ooops. ;)
fixed that, wango!! this thing actually sounds fairly good!

will not run on a 9v wart, despite having a 9v input jack. gotta be 18v i'm assuming, as 2 batts work great. ... very clean, very loud, you can def shade between different guitar tones and, well, "impersonate" them.

so anyways.... midrange 2 slider is broken, anybody got a good replacement for this they can reccomend? it's 1.34" long and seems to have 4 connections to the board. must admit i'm not used to slider pots, so advice is appreciated!!
thanks!
jimi
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pinkjimiphoton
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Post by pinkjimiphoton »

modman asked me to get some pics and verify the component values in the contested schematic,
i can't see well enough to read the damn values, but here's some phone pics for now...

the schematic is also missing a small transformer apparently...

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"When the power of love overcomes the love of power the world will know peace."
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