"Little Angel" - Super Simple PT2399 Mini Chorus

[Govmnt_Lacky]

I dont know if it is particular to this circuit however, I have put Op Amps in backwards and they have survived in most situations..... Actually 1 situation since it has only happened twice! So I guess you have a 50/50 shot.

Good Luck! 

[clamup1]

numbers

1-8.1
2-8.37
3-8.75
4-8.75
5-8.29
6-8.26
7-8.26
8-8.80

this is with the battery in and on the neg side.

[Govmnt_Lacky]

Uhhhhhh.... Hate to say it but. THAT BAD BOY IS FRIED!!!

That is unless you ran supply power to EVERY pin. You should have Input power on pin 8 and Ground on pin 4.

[clamup1]

i was wondering why i had power on all the pins. damn. oh well i got more coming. i was hoping i would get this one to work first time

[waltk]

oh well i got more coming.

5532 opamps are highly recommended (a little low on the input impedance, but a great driver on output).  Not to start a debate or anything, but between these and TL072 you are pretty well covered for anything you would want to build.  Someone is selling 50 5532's on Ebay for 10.99 (including shipping) at the moment.  If you plan to continue building DIY stompboxes, I would just order a nice supply.

[clamup1]

i ordered some from small bear yesterday. i should of checked out ebay. thanks for the info. ill check them next go round

[John Lyons]

oh well i got more coming.

Someone is selling 50 5532's on Ebay for 10.99 (including shipping) at the moment. 

Thanks for the tip. I got 50 and some caps as well.
50ish pages of non sorted items later...

[Pigyboy]

Hmm, I can only find a link for 50 x 5532's for $14.95 + 5 shipping on ebay. 

Will 5534's work as well? Is it much difference between the 5532 and the 5534?
I have a bunch of the 34's but no 32's.

[John Lyons]

A 5534 is a single op amp. A 5532 is a dual.

This is the only current auction the guy has for 5532s now.
Still a good deal.
http://cgi.ebay.com/Lot-50-NE5532-NE5532P-5532-Dual-Low-Noise-OP-Amp-/220664349135?pt=LH_DefaultDomain_0&hash=item33609ec1cf

[Earthscum]

That's not bad. That comes out to 28 cents apiece. Tayda has them for 32 cents each, if you don't need 50. For $14.60 (after shipping) you still get 40. That's not bad, either.

http://www.taydaelectronics.com/servlet/the-93/5532-DUAL-INSTRUMENTS-LOW/Detail

[clamup1]

oh i used a 3904 as the tranie. i read it could be used but didnt look to see if anything else had to be changed. will it work when i get the new chip or ar there other things that need to be changed?

[frequencycentral]

oh i used a 3904 as the tranie. i read it could be used but didnt look to see if anything else had to be changed. will it work when i get the new chip or ar there other things that need to be changed?

The 3904 is a NPN transistor. The 'tranny' in this circuit is not a 'tranny', it's a 5v voltage regulator.

[culturejam]

oh i used a 3904 as the tranie. i read it could be used...

Where did you read that?

[Earthscum]

oh i used a 3904 as the tranie. i read it could be used but didnt look to see if anything else had to be changed. will it work when i get the new chip or ar there other things that need to be changed?

This doesn't use a transistor as the controlling element for the LFO like the designs for other PT delays use. This has 2 chips, a 5V regulator, and a handful of Resistors and caps (and whatever else you want to mod it with). The LFO connects directly to the chip.

[clamup1]

i thought i read it in there somewhere oh well. now i need to beg the wife for more money. 

[Taylor]

That is indeed an unfortunate tranny surprise.

[Pigyboy]

That is indeed an unfortunate tranny surprise.

Had a 'Trannie' surprise in a bathroom in SF one night. Indeed, unfortunate.

[clamup1]

hey does the words on the LFO go toward the ic or away from it.

[clamup1]

[/quote]

sorry i found the pic

i get clean sound. no chorus. its prob the offboard wiring. i hate offboard wiring

[Güero]

i get clean sound. no chorus. its prob the offboard wiring. i hate offboard wiring
[/quote]






I think that 7805 regulator is inverted...

Try the actual orientation