Nyquist Aliaser Ring Mod.

Gila_Crisis · October 08, 2006, 04:03:14 AM

hi,
i need some help.
i build this ring mod (more infos here http://www.diystompboxes.com/smfforum/index.php?topic=40860.0, but it doesn't work! the opamp is a tl072 transistor i used bc550 and F245A
what could be?
btw here some pics:

Paul Perry (Frostwave) · October 08, 2006, 09:47:53 AM

>90% of stuff-ups are shorts & pin errors.
But, I'm wondering whether the fet you used is really an equivalent to what is in the original circuit (and if so, whether the pinout is the same).
Personally, when I build something 'weird' from a circuit on the net, and it doesn't work, I try again with the exact components.
At least the circuit is from a reliable source!

Gila_Crisis · October 08, 2006, 06:13:14 PM

the bc550 are equivalent to the 2n5210, i'm sure.
the F245A i'm not! do some one here know an equivalent transistor of 2n5457?

Paul Perry (Frostwave) · October 08, 2006, 07:41:36 PM

The 2N5457 is equiv to 2SK330, if that helps.
If by F245A you mean BF245A I would have expected that to work (but, I havn't checked the pinouts.)

What country are you in?

Marcos - Munky · October 08, 2006, 11:33:48 PM

I heard that the BF245 is equivalent to the J201/2N5457, but neither me and a friend had lucky using one.

Gila_Crisis · October 09, 2006, 01:59:24 AM

i live in switzerland

Gila_Crisis · October 09, 2006, 04:52:37 AM

and other opamp equivalnt to tl072? i know the ne5532 is equivalent, but are there others?

Paul Perry (Frostwave) · October 09, 2006, 05:44:22 AM

http://www.banzaieffects.com/product.php?productid=16537
a European source, but prob just as easy to get it from Steve at Smallbear in USA!

Gila_Crisis · October 09, 2006, 10:35:39 AM

today i checked the circuit with a friend who is electronic eng. and we founded so things that are wrong or look strange. this evening i'm gonna fix them, and maybe hope fully tomorrow the thing is gonna work. maybe...

Coriolis · October 09, 2006, 01:01:09 PM

Well, the TL072 IS NOT equivalent to a 5532!
The TL072 is a fet-input opamp, while the 5532 is bjt-input. The TL072 has much higher input impedance if I not mistaken...

C

Gila_Crisis · October 09, 2006, 02:10:43 PM

ops.. sorry... i thought it was so cause i saw moosapotamus used lm5532 in place of tl072...

swt · October 09, 2006, 02:53:51 PM

i'm using bf245a in all circuits that call for fets, and never have a problem...they do have a little different bias though

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Nyquist Aliaser Ring Mod.