I just noticed on the schematic that the circuit doesn't have polarized 1uf caps but on the perfboard layout they are polarized. Does it matter which you use? http://www.runoffgroove.com/eatremolo.html

It will certainly work with electrolytics, I built mine with them. But I've heard it works better with poly caps.

Regards

RDV

Electrolythics worked for me and it sounds great!

I used tants- but thats all i had at the time and it sounds great--

I think I might have used electros..... Just measure which capacitor connection has the higher +V and that's the + side of your cap...should work fine

yeah, it won't work if you use electros backwards.  actually i can't back that up with any science, but i got one backwards once and it didn't work until i figured out which way to put them.

looking at the schem here:
http://www.generalguitargadgets.com/v2/diagrams/eatrem2_sc.gif

C5 - +ve towards R9 & collector of Q3
C6 - +ve towards R10
C7 - +ve towards R11

HTH!  btw, i used tants because the case i was using didn't have room for film or electros and to be honest, i think the non-linearities of the whole FET gain element thingy far outweigh any benefit to getting a 'purer' sine wave by using high quality film caps.

Quote from: idlefactionyeah, it won't work if you use electros backwards.  actually i can't back that up with any science....

I saw a blurb in Radio-Electronics magazine long ago that said the first use of electrolytic caps was actually as rectifiers :shock:.

Take care,
-Peter

I would love to build this one... but it looks kinda complicated!   :shock:

What are the component parts? (Q1, Q2...)  And how do you connect them?  Also, how would you connect the different pots to the board

I'm still a newbie- so prepare yourselves for a ton more questions coming up... :twisted:

Quote from: AxmanjrWhat are the component parts? (Q1, Q2...)  And how do you connect them?  Also, how would you connect the different pots to the board

Layout etc here:

http://www.runoffgroove.com/eatremolo.html

It's an easy build

You should also check out RG's layout. I used this one and it works great...easy and fun.

http://www.geofex.com/PCB_layouts/Layouts/eantrem.pdf

Thanks Michael Allen for the link!  By the way, what are the values for the pots (level, depth, speed)?

Also, if I were to hook-up an LED, where would I place it in the schematic?  Would I need anything else for the LED (an extra resistor...)?  

Thanks in advance!

heh welcome

you can find the ea trem and loads of other high quality projects at
http://www.generalguitargadgets.com/

HTH!

And Small Bear Tweak-O is a good pictorial of how to wire everything including pots.
 The LED's you have to find the flat portion of the circle at the base of the lens...that corresponds to the schematic of the LED's flat 90* marking.
 It took me a few times to get it...now I have two nice ones.
 DIY FAQ has alot of good info and links you may find interesting.

When I look at this page http://www.generalguitargadgets.com/v2/diagrams/eatrem2_sc.gif, I notice that, for the VOLUME, DEPTH, and SPEED controls, it says 25k-A, 1M-B, and 25k-A (respectively).  Also, does R12=VOLUME, R13=DEPTH and R14=SPEED? Are these the pot values?What does A and B stand for (my guess would be AUDIO and LINEAR :? )?  

But then I look at this page  http://www.runoffgroove.com/eatremolo.html, I see that the values are different (VOLUME=100k-A, DEPTH=250k-L, RATE=100k-RA).  I'm assuming L=linear.  But what is RA?

Of the two above links, which is more preferred?  Also, could I switch the pot values around (ie use the runoffgroove.com pot values in the GGG.com schematic)?

Lots of questions, but I'm still at a lost...

Quote from: AxmanjrWhen I look at this page http://www.generalguitargadgets.com/v2/diagrams/eatrem2_sc.gif, I notice that, for the VOLUME, DEPTH, and SPEED controls, it says 25k-A, 1M-B, and 25k-A (respectively).  Also, does R12=VOLUME, R13=DEPTH and R14=SPEED? Are these the pot values?What does A and B stand for (my guess would be AUDIO and LINEAR :? )?  

But then I look at this page  http://www.runoffgroove.com/eatremolo.html, I see that the values are different (VOLUME=100k-A, DEPTH=250k-L, RATE=100k-RA).  I'm assuming L=linear.  But what is RA?

Of the two above links, which is more preferred?  Also, could I switch the pot values around (ie use the runoffgroove.com pot values in the GGG.com schematic)?

Lots of questions, but I'm still at a lost...

RA means 'reverse audio', a hard to find little bugger.
I used the Runoff Groove version, but both work, the GGG version doubles as a booster. No I don't think you can switch around the pot values.

Regards

RDV

I guess you could use a 500M RA pot from small bear.

If you can't get a reverse audio, then a linear is a better thing to have than an audio.

Would that be a 25k linear pot for SPEED?

Also, was I correct in saying that A=audio and B=linear?

Hi Axmanjr, maybe this article will make that clear, as well as other stuff about pots.

http://sound.westhost.com/pots.htm