Carlsbro - Echo  [schematic]

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

This one:
http://www.effectsdatabase.com/model/carlsbro/alu/echo

which is this one:
http://www.dirk-hendrik.com/temp/Carsbro_Echo.pdf

Nope. A R5101 Reticon is not suitable for a new project. They're more rare than Pygmee foreskin leather. But since I have one of these with a (thoroughly) confirmed dead Reticon a rework for a PT2399 is in the make. Not analog anymore but still with the same heavy filtering which will then be called "analog voiced" :blackeye
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Post by briggs »

:thumbsup I look forward to seeing this one Dirk! Work you're magic... "Pygmee foreskin leather".... :applause:
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Post by ttdom »

i still have the original schematics somewhere, mailed carlsbro a few years ago and they sent it, any interest for that? could make a highres photo

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Post by Dirk_Hendrik »

Definitely. When I traced this one about 2 years ago I had quite a pleasurable email conversation with Carlsbro as well. They did not have this stuff archived anymore so were happy with all support that enabled them to help their customers with enquiries about old junk.

Compare that to "they're ripping me off by tracing my product" howlers :thumbsup
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Post by ttdom »

ill have a try tomorrow, when there's more light in my room;)
apparently there's a mark 1 and 2 version of which i have both schematics..
got the pedal too, nice, tho bit lowfi

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Post by ttdom »

MK1
Attachments
schematics mk1
schematics mk1

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Post by ttdom »

MK2, the copy was a bit messy but i think all is readable
Attachments
BW_CarlsbroEchoMK2.jpg

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Post by ttdom »

and they even sent me a nice infosheet,
supporting products from 25+ years ago, not bad indeed
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Carlsbro FX Advertisement.jpg

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Post by ttdom »

that mantis sounds quite a bit cleaner, nice.. judging from the youtube that is

https://www.youtube.com/watch?v=I_1pcIPWpgs

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Post by Dirk_Hendrik »

Cool to see the original!! Bedankt! :applause: :applause:
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Post by Dirk_Hendrik »

How about some color ;) ?
Carlsbro effects in1.jpg
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Post by sonathanjim »

Well this thread has turned out very useful.
Would anyone have any idea why this pedal might have a faint "ghost" wet signal coming through even when the effect is off?
Looking at the schematics I have the MK2 version.
From the notes on the schematics it looks like mine hasn't had the first change made but the second resistor hasn't been changed.

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Post by Oneoff7 »

Thanks so much for uploading the schematics! You helped me save
My echo and also modify it to work with external power adapter,
Add a power swich and reverse protection diode.
Now looking into a true bypass wiring with a new swich,
And maybe add a 15V power regulator (although the circuit has a 15V zener
Diode already).
The only concern I have is the ‘metalic’ Sound the repeats
Have with a very long delay and ‘swell’ knob on high.
I guess it’s the nature of this unique reticon chip?

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