Something weird about this schematic

[uki]

Hey guys !

I'm building a new pedal and I come across some strange things on the schematic,
in the PT2399 IC, pins are out of order or what ?
See pics and docs.

[sluckey]

It's very common to rearrange pin locations on a schematic just to keep the schematic clean and easy to follow rather than having wires crossing all over the place. This becomes even more important with high density schematics.

There is nothing wrong with the schematic even though the pins have been shuffled around. Pin 2 is still REF, pin 6 is still VCO, pin 4 is still DGND, etc.

[uki]

Thanks Sluckey

I didn't know about that, now I know when breadboarding it I have to follow the real pins in the IC!

 

[uki]

I'm having some problems to get this to work, checked the connections and components several times for errors,
all seen correct.
 
The input from guitar is very weak and only when strumming the strings hard there is a little sound in the amp.

I know the circuit is partially working because when I touch some of the components there is a reverb like sound.
LED isn't pulsing. I did compare some of the schematic with the veroboard layout(difficult to reverse enginner), something isn't right.

I have doubts about some symbols in the schematic:

1 -  VB1, they connect together yes? same to VB2 ?
2 - TL072 ICs are not using pins 4 and 8, is that right?
3 - What are those PIN inside a circle?

I've redrew part of the schematic for better reading.

Thanks in advance

[jojokeo]

I have doubts about some symbols in the schematic:

1 -  VB1, they connect together yes? same to VB2 ?
2 - TL072 ICs are not using pins 4 and 8, is that right?
3 - What are those PIN inside a circle?

I've redrew part of the schematic for better reading.

Thanks in advance

You get this figured out uki?

answering your questions:
1- various people use differently labeled voltage points, sometimes it'll say V+, or +9V, or VCC, Va, Vb, Vc or whatever - but yes, look at the voltage that one of these labels is stated to be then be sure wherever the schematic or vero layout says is to go, you connect that voltage point everywhere it states.
2- on all dual op-amps pin 4 = ground and pin 8 is +9V OR when using a bi-polar power supply pin 4 = -9V and pin 8 = +9V
3- I'm assuming you're speaking of the black jumper wires with the blue circles w/ white centers on the layout board? This means a ground point with two wires soldered at that spot. Example - when you see the ground wire on row 4 with a line and two blue spots - This ground wire is connected and soldered at 4 points - the beginning and end, and at those two pin spots making those 4 rail points all ground rails at those 4 points along the way.

[uki]

You get this figured out uki?

answering your questions:
1- various people use differently labeled voltage points, sometimes it'll say V+, or +9V, or VCC, Va, Vb, Vc or whatever - but yes, look at the voltage that one of these labels is stated to be then be sure wherever the schematic or vero layout says is to go, you connect that voltage point everywhere it states.
2- on all dual op-amps pin 4 = ground and pin 8 is +9V OR when using a bi-polar power supply pin 4 = -9V and pin 8 = +9V
3- I'm assuming you're speaking of the black jumper wires with the blue circles w/ white centers on the layout board? This means a ground point with two wires soldered at that spot. Example - when you see the ground wire on row 4 with a line and two blue spots - This ground wire is connected and soldered at 4 points - the beginning and end, and at those two pin spots making those 4 rail points all ground rails at those 4 points along the way.

Hey Jojokeo thanks !

Question 1 and 2 I got it !

About 3 that isn't what I'm talking about, not in the layout, but in the schematic.

Oh I think I see now what I've missed...

Look in the picture the "PIN" text inside a circle, what is that ?

[jojokeo]

About 3 that isn't what I'm talking about, not in the layout, but in the schematic.

Oh I think I see now what I've missed...

Look in the picture the "PIN" text inside a circle, what is that ?

Without seeing the entire schematic clearly I'm guessing that it is being noted that by saying "pin" it implies to connect the top one to the positive pin terminal and lower one at ground potential is to be connected to the negative pin terminal of whatever chip that's in the schematic to be powered by (at these two locations).

[uki]

Oh here is the schematic!

[jojokeo]

I'm pretty sure that those are simply test point pin locations Uki. You can test the circuit's voltage and input/output at these locations. They supply the boards and parts in kit form and allows for basic things like this to assist others when troubleshooting is needed.

[uki]

I got it !!

The circuit is working in the breadboard, and sounds really good !!!

Thanks guys !

[Bantam]

2399 is sorta particular about its voltage with the voltage regulator and I think you can even get a chorus out of it by varying the voltage another thing I've learned from those is there's lots of good chips and bad  chips I was lucky to get a tube of them and they all seem to be good.

The mad professor deep blue delay is a really great circuit and I have it on my board all the time clone from tagged board effects.

[jojokeo]

2399 is sorta particular about its voltage with the voltage regulator and I think you can even get a chorus out of it by varying the voltage another thing I've learned from those is there's lots of good chips and bad  chips I was lucky to get a tube of them and they all seem to be good.

The mad professor deep blue delay is a really great circuit and I have it on my board all the time clone from tagged board effects.

Those 2399s come straight from the China machines and like their other cloned USA products are a grab bag of you get what you get. We can only hope they use them in their military equipment if we ever have to send them a message in the Spratley's?

I just use my old original slightly modified Boss DM-2.