Hi to all...Question about Dr Quack

[ZeRoTrE]

Hi,
I'm from Italy, excuse me for my english, i hope that you'll understand me...

I don't know too much about electronic then consider it.
I'm drawning some scheme with eagle software (cad for electronic scheme), i make a scheme of the Dr quack  original scheme, i've added to this scheme the wiring connection with a 3pdt footswitch, a battery, a DC jack (use the battery or an external power supply), and a led with res, trying to make a tru-bypass, i'm not sure that i make it correct, i'm not sure about jack in and out connection, i've found a truebypass scheme in a german site.

eagle schematic Dr Quack

If it works can i use the same connection with other effect?
TIA, also for your patience.
Best regards.
Zerotre.

[sir_modulus]

Yes, I think that's a way to do it. Tonepad has an offboard wiring link (it's in the link), and it'll show you all the ways to do it!

Cheers,

Nish

[ZeRoTrE]

Thanks for your answer!
I've found a lot of bypass scheme...it seems that they are simple but i've some doubt about jacks, i've bought someone that the salesman told me that are mono, but they have 3 pins, and i've found in some scheme that also stereo jacks have 3 pins (i read that they are used to save battery).
Some photos of my jacks...

I think that is the ring pin
http://afrancesco.free.fr/fotomie/Guiteffect/valve_dt_fr_5.jpg

tip and sleeve (if i understand well)
http://afrancesco.free.fr/fotomie/Guiteffect/valve_dt_fr_7.jpg

Then for the eagle schematic that i've posted, i must use stereo or mono jacks?  

Thanks again.
Best regards.
Zerotre.

[sir_modulus]

Hi there,

I guess I should now start my jack lecture. How this works is, for DIY guitar effects, you have two types of jacks: Mono and Stereo. Mono Jacks use a cable that has a signal, and a ground. Stereo have Signal A, Signal B, and ground.

Legend: Ring = ground, Tip = Signal A, Sleeve = Signal B

Mono Jacks:
-Basic: Just a ring connection, and a tip connection.
-Closed circuit: A Basic Jack with a piece of metal inside that shorts the tip to ground when no plug is inserted. The third lug has to be put to ground to short the tip. This is what you have.

Stereo Jacks:
-Basic: Ring, Tip and Sleeve connections. There is an alternate use for these also. For guitar effects, this is used as a power switch on the input. When the cable is plugged in, the effect is on. This works by putting: The ring to ground, the tip to the input on the switch, and 9V to the sleeve. when a mono plug is inserted the 9V gets connected to ground, and the circuit recieves power. If no plug is present, the 9V is isolated, so no current flows through the circuit.

There are other types of Jacks other than these ones, but they are not used in basic guitar effects. I'd use any of the jacks from Small Bear as references for good jacks, as they are the standard, and noone runs into problems with them.

Cheers,

Nish

[ZeRoTrE]

Many thanks for the explain, let's see if i understand it! :?  :lol:
then about the eagle schematic will i must use a stereo jack for the input, and a mono (basic?) for the output?
More complicated...
there are some mono jacks with 4 pins, and stereo with 6 pins how did i connect them?

http://afrancesco.free.fr/fotomie/Guiteffect/monojack.jpg
http://afrancesco.free.fr/fotomie/Guiteffect/stereojack.jpg

How could i use the jacks that i have, i tried to make another effect but it doesn't work well, i connect the input to the tip and the ground (negative) to the pin that i think is the ring, the pin that you can see in the first photo, i've made a very simple circuit with no switch.

http://afrancesco.free.fr/fotomie/Guiteffect/valve_dt_fr_4.jpg

original scheme:
http://afrancesco.free.fr/fotomie/varie/valve_dt.gif

I'm sorry for all this questions, but i would like to know what about i'm doing... an example?
I've made a lot of errors, i did not know anything about opamp, then i have used 2 ICs :lol: according the two triangle on the scheme, again for the ics no power supply, there isn't in the scheme.... also  i have confused, the in+ and in- pin...and so on...now i'm reading a lot about and i understand some things but i'm not sure that i've understood well..
Thanks again.
regards
Zerotre.

[sir_modulus]

I dunno exactly how the plastic multiple pin jacks work. They are used in a lot of marshall stuff, and various pedals. I'll let someone else handle explaining that one.

Now in regards to the circuit:
Here is a NE5532 (dual Opamp):
http://www.fairchildsemi.com/ds/NE/NE5532.pdf

I'd also suggest reading this:
http://www.generalguitargadgets.com/richardo/distortion/index.html

also have a look at some of the stuff here:
http://www.geofex.com/

Hope that helps, post any other questions you have here, we'll all be happy to help you!

Cheers,

Nish

[ZeRoTrE]

Thank you!
I've had some problems with the op amp, but a few days ago i start to search more information about them, now i can take care about them, but i think that some errors that i've made can have made the effect works wrong...
Now i would like to understand if the scheme for dr quack is correct, and what kind of jacks i must buy, and how it's correct to connect them, for the other effect i think that i take some new components and i'll try to make it again (or i will try with a hammer....) .
Thanks a lot.
Regards.
Zerotre.

[sir_modulus]

Alright! Now that's the spirit!  

The scheme at tonepad. The scheme #5 is what I use to wire ALL my pedals (3PDT, truebypass, Led, and inut grounding). I think it's one of the best schemes to offer, as it has true bypass and LED indication like most schemes, and it also offers the ability to have input grounding (the input if grounded in bypass mode, to stop high gain effects from leaking their signal into the bypassed ones.

In regards to which Jacks to buy, I'd go with the following Jacks:
I'd go with something in the style of: (from anywhere, examples are from Small Bear Electronics)
I'd go with the Switchcraft #12B or #112B for the input and Switchcraft #11 or #111 for the output.

I recommend Switchcraft Jacks, as they are real smooth in their operation, and they just are top notch when it comes to quality. I personally use the open circuit ones when I can (no real reason), and the enclosed ones in a tight box (that way, it's hard for something to touch the jack.

Now when it comes to the Doctor Q, I would suggest a different pedal. I like the Dr.Quack, but it seems your doing it on breadboard. This pedal has no readily available breadboard template, so I'd go with: Nurse Quacky. I Like this one, as it has a nice breadboard layout also.

Cheers,

Nish

[Paul Perry (Frostwave)]

I use the PCB mount sockets wiht six pins for everything (with six pins, they hold on better, right?)
There is no problem havign "too many" pins, I don't connect them all!
Just use a cable and a multimeter to see what connects when you have the plug in, and out of the socket.

[ZeRoTrE]

Thanks to all for the answer!

Bypass->
ok now i'm starting to change the scheme.

Jacks->
Ok then i've understood well, i'll try to find the same type of jack, but if i find a stereo jack and a mono with 3 pins, how must i use it? I see the photo at small bear, there are tip ring and NC, must i use tip and ring, and NC? Must i leave it no connected?

For the quack/nurse question, i'm working with eagle because it offer the possibility to make a pcb layout by itself after you make the scheme, i don't know the correct english term , but in italy we use the term: "untangle the scheme", a little (lot of my errors) example...
http://afrancesco.free.fr/fotomie/varie/valvebd.jpg
You only have to move the components in the position that you want, then the software make the connection, if you are interested in a scheme let me know about it and i make the pcb layout for you.

Bye
Zerotre.

[ZeRoTrE]

dr quack layout ready for soldering...

http://afrancesco.free.fr/fotomie/Guiteffect/drquackbd.jpg

Bye
Zerotre.

[ZeRoTrE]

Hi
Ok i made it!
I think it works but i must do some others tests.
In the scheme there are two led what about this led? And the dpdt switch? What did they do?
Thanks.
Regards.
Zerotre.

[AzzR]

The dpdt switch if im not mistaken lets more bass through when it is down, these are the exact words from the Dr Q manual. "The bass switch lets low sound through when it is down and is especially usefull when playing bass or bottom string notes on lead guitar.

Also does the Dr quacky have a true bypass and what do those LEDs Do?

Thanks

Hope that helped

Dream

[spudulike]

http://www.elixant.com/~stompbox/smfforum/index.php?topic=35760.0

The LEDs are for biassing and to allow different dual opamps to be used. See my post linked above for my build report. I used various different chips/trannies/leds and the results are all there. Oh, and a new pcb layout that fits a 1590B.