Electro Harmonix Frequency Analyzer "notes"

[toneless]

Hi.

I've reversed engineered the Frequency analyzer and I wanted to post some stuff and notes in case someone needs them for fixing a mulfunctioning devise.

Have fun!

ps. perhaps someone can post those files on a site or something...

cables layout



power supply schematic




Bill of Materials :

Resistors
R1  120k
R2   68k
R3  3.6k
R4   10k
R5  150Ω
R6  220κ
R7  2.2Μ
R8  2.2Μ
R9   12κ
R10  15κ
R11  33κ
R12 4.7κ
R13  36κ
R14 2.4K
R15   2K
R16  22K
R17 680Ω
R18 680Ω
R19  82K
R20 200K
R21 150Ω/1W
R22 150Ω/1W
R23   2Κ
R24  22Κ
R25   1Κ

Pots
1 - 25K  linear   "blend"
1 - 2.7Κ linear    "fine"
1 - 247K rev.log "shift"
1 - 1M trimmer          (adjust untill there is no bleedthrough at all!)

Capacitors

C1   10μf/50v bi-polar
C2  2.2μf/50v bi-polar
C3  2.2μf/50v bi-polar
C4  103K/100v
C5  104J/100v
C6  104J/100v
C7  154K/100v
C8  473K/100v
C9  100μf/50v
C10 470μf/16v
C11 470μf/16v
C12 104J/100v


IC's
1 - iCL8038CC
2 - JRC4558
1 - 741
1 - AD633


other
IC sockets
1 - 1N4003  diode
2 - 1N4744A diodes  
1 - dpdt slide switch
1 - 3PDT (This one is Used as a simple spdt!!!)
3 - quarter inch mono jacks
DC jack
Copper - clad board, etchant, stranded wire
Enclosure


Power Supply bill of materials:

120Vac (0r 220Vac) primary to 30Vac secondary, 100mA
4 - 1N4004 diodes
1 - 1000mf/63V electrolytic capacitor
1 - convenient dc jack to connect to the fx enclosure
Copper - clad board or perfboard, stranded wire
1 - suitable plastic enclosure for the adaptor

[toneless]

...and here are a few possible mods.

@Use a heavy duty dpdt for the "filter" instead of the slide switch.

@Use an extra jack and control the "shift" with an external expression
pedal.

@Use a switch and a LDR to control the "shift" pot ala theremin style.

@Add a led. Preferably a big blue one!

@Use a feedbacker (Total sonic Annihilation etc) among the input and
outputs! See what happens...

[toneless]

...and here is a nice template (made with the mspaint) with a few parts for anyone that needs them.

[toneless]

Any comments??? :?

[nelson]

Nice work.....

[Basstyra]

Yeah, nice work !  :wink:

[Basstyra]

May I post some photos of mine to illustrate your topic ?

[toneless]

Basstyra this is the old version of the Frequency analyzer with the AD533 chip.
The layouts and the "bill of materials" that I posted are from the recent version of the EH ring modulator with the AD633 chip.

Nevermind  they actually have lots of common parts anyway...

[Basstyra]

Yeah, I know. I just couldn't resist to show you my recently totally repaired pedal !    :oops:

[puretube]

Basstyra: are you sure you hardwired the ground-lead of the mains wire to the chassis? (the green/yellow one for "safety"...).
And isolated the 230V connections well enough?  :shock:  :roll:  :twisted:

http://diystompboxes.com/sboxforum/viewtopic.php?t=33844

[swt]

hi guys! thanks for the info. Does anybody has the schem for the ad633 F. analyzer?? Thanks a lot!

[Basstyra]

I got that here, but I didn't find the thread.

I can put it online, but right now I'm not home, I'll do this as soon as I get home.

[vigorandkandor]

hey i need pictures of the inside of the older FA. I have one that is out of order. i need pictures of the switch, and where all the other wires go. if i get it working i am hoping to sell it. any help will be much appreciated.

[Dan N]

I wonder how it would effect the sound to tap a different wave shape off the ICL8038.

[Fp-www.Tonepad.com]

Pardon my ignorance. But, what does it do?

I think I have that schematic... somewhere 

Fp

[Paul Perry (Frostwave)]

fp, it's a ring modulator.
One thing I don't like: using an 8038 as the local oscillator.. you can't get a wide enough range (for my extreme tastes) plus, the 8038 is hella thirsty on power.
And the AD633 is relatively expensive (but, in my opinion, worth it! if you want to be able to null out oscillator bleed).

[vigorandkandor]

bump for the picture.

come on basstyra i know you could open yours up and help me out.

please

[Sgt_Rutters]

Here's the inside of my old Frequency Analyzer, hope this helps!

[Sgt_Rutters]

Ah, just realized you might have been talking about the stompswitch...if so, the yellow cable goes to one side with a jumper from it to the other side of the switch both on the bottom lugs, then the black wire from the pot on the left in the picture is attached across from the yellow cable.  Hope that makes sense...

[vigorandkandor]

kinda of makes since. if you could get a picture of it that would clear everything up. thanks so much for your help!