Echo Base - a new PT2399 delay

[slacker]

Does anyone see an obvious component that maybe fried, like D1 or something I should try first.

Most likely thing is D1 is the wrong way round, that would also explain why you got negative voltages with the polarity reversed, if D1 was correct it should have stopped that. Before you fire it up again I would remove all the ICs except the voltage regulator, power it up and make sure you get 9 volts across +9 and ground and 5 volts on pin1 of where the PT2399 goes.

[slacker]

I been through all these posts (seriously!) and whilst I was getting really eager to build one with the momentary footswitch for tap one recent post said it was not possible anymore.

You can add tap tempo using the Tone God's taptation available from Aron's store. http://www.diystompboxes.com/smfforum/index.php?topic=86294.0

[Barcode80]

I been through all these posts (seriously!) and whilst I was getting really eager to build one with the momentary footswitch for tap one recent post said it was not possible anymore.
Why? any alternatives?

I think for @deadastronauts despair I'll abandon distortion for a bit. I'll come back for that mean beast you recommended though!

what post said this?!?!

always been able to do it with the taptation kit as an add-on to the circuit (see slacker's post above), and that hasn't changed. aside from that, there never was anything in the stock circuit for tap that I saw (although maybe I missed it...)

[jplebre]

Is the tap tempo mod really that easy to build? http://www.diystompboxes.com/smfforum/index.php?topic=60662.msg628311#msg628311
I know there is another thread http://www.diystompboxes.com/smfforum/index.php?topic=81668.0 but I'm really tired now I'm going to read it tomorrow

The PTAP is no longer available. The only thing right now for tap tempo PT2399 is that Taptation available in Aron's store at the top of the forum. But it also hasn't been available for a while. I think Aron will have them at some point.

from here

[Barcode80]

Is the tap tempo mod really that easy to build? http://www.diystompboxes.com/smfforum/index.php?topic=60662.msg628311#msg628311
I know there is another thread http://www.diystompboxes.com/smfforum/index.php?topic=81668.0 but I'm really tired now I'm going to read it tomorrow

The PTAP is no longer available. The only thing right now for tap tempo PT2399 is that Taptation available in Aron's store at the top of the forum. But it also hasn't been available for a while. I think Aron will have them at some point.

from here

Ah. Yes, Aron and Tony have kept the Taptation in stock in Aron's store much more reliably as of late. The taptation is the way to go.

[LaceSensor]

Built an echobase with all the mods (bar tap tempo) inc an FX loop.
It was inserted between the level wiper and board.
Works great!
Here is a demo of all the pedal for the guy I am making it for.

[Jaicen_solo]

Dammit. Another pedal I have to build. 

I think it's about time you read the code off your XP300 so I can make my XP100 into a space station.

[LaceSensor]

Someone already did that I think.
XP300 kicks ass.

[Jaicen_solo]

They did, but the code is not available. If we had the code, we'd all be doing it!

[slacker]

Nice demo, glad to hear the FX loop worked out.

[LaceSensor]

Nice demo, glad to hear the FX loop worked out.

All thanks to you and Tayloe, good sir.

Makes me wanna make another 'base and add more mods! Might just order another PCB...

[modallaire]

Does anyone see an obvious component that maybe fried, like D1 or something I should try first.

Most likely thing is D1 is the wrong way round, that would also explain why you got negative voltages with the polarity reversed, if D1 was correct it should have stopped that. Before you fire it up again I would remove all the ICs except the voltage regulator, power it up and make sure you get 9 volts across +9 and ground and 5 volts on pin1 of where the PT2399 goes.

Thanks, that solved one problem.  But I still don't have any delay. Bypass switch doesn't do anything.  I always have a clean signal with no delay.  LED does not come on either. I have performed voltage and audio tests.  Here are the results.

Pt2399                                              CD4066                                              U1                                   U3                                 7805
1 : 5V         16   2.5V                  1 :  4.5V          14 :  9.3V                    1 : 2V          8 : 8.7V          1 : 5V     8 : 9.3V      In 9V  G 0V  Out 5V
2 : 2.5        15   2.5                    2 :  4.5            13 :  9.1                       2 : 7.9         7 : 8              2 : 5       7 : 5       
3 : 0           14   0.08                  3 : 0.1             12 : 8.9                        3 : 5            6 : 5              3 : 5       6 : 5   
4 : 0           13  3.5                     4 : 0.05           11 : 4.5                        4 : 0.6         5 : 0.4            4 : 0       5 : 4.5
5 : 0           12  4.8                     5 : 0                10 : 4.5
6 : 4.2       11  0.9                     6 : 0                 9 :  0.08
7 : 4.2        10   2.5                    7 : 0                8 : 2
8 : 0            9  2.5


Audio : no signal (sometimes noise) except those noted below :

PT2399 pin 15 : clean signal  all other pins without signal

CD4066  Pin 1 and 2 : clean signal

U1 : nothing
U3  pin 1, 6 and 7 : clean signal
U3 pin 5 : clean signal + hiss noise


If anyone sees something that can help, it would help me greatly. 

Marc

[jplebre]

Is the tap tempo mod really that easy to build? http://www.diystompboxes.com/smfforum/index.php?topic=60662.msg628311#msg628311
I know there is another thread http://www.diystompboxes.com/smfforum/index.php?topic=81668.0 but I'm really tired now I'm going to read it tomorrow

The PTAP is no longer available. The only thing right now for tap tempo PT2399 is that Taptation available in Aron's store at the top of the forum. But it also hasn't been available for a while. I think Aron will have them at some point.

from here

Ah. Yes, Aron and Tony have kept the Taptation in stock in Aron's store much more reliably as of late. The taptation is the way to go.

Damn! I was pretty sure I hit reply on this!
Thank you very much Barcode!

[jplebre]

Been trying to figure out which mods I want. I found somewhere a mod for the hardwire version, which added a 3pdt switch.
My question is, what is that extra "Flashback" mode?

Also, I don't need the CD switching anymore, but, if I want to make the LED (for bypass) work with the timing (Layout posted here) should I use the 3rd pole of the 3pdt switch on the LED (after the board), on the 5v supply of that board, or between pin 5 and that board?

Hope I made sense....

Cheers

[slacker]

If you mean the one from MarcoMike a few pages back then "flashback" is the same as what I called Boss mode,the output of the PT2399 is cut in bypass but the input is left connected. The extra mode is "direct" where both the input and output of the PT2399 are cut when bypassed.

Not sure which layout you mean but you probably need the switch to break the connection to the LED, doesn't matter where before it or after would both work.

[jplebre]

Hey Slacker! Thank you for your reply!

I was referring to these 2:



Hmm.... so what's the difference between direct and boss? I mean both i/p and o/p get cut, and the signal still goes through the i/p buffer. Isn't there a mistake in that wiring?

For the LED question, that would be the second image. So, again, would be best to use the stomp switch for the LED on the power supply for this section, pin5 to this section or from this section to the LED?

[Taylor]

Hmm.... so what's the difference between direct and boss? I mean both i/p and o/p get cut, and the signal still goes through the i/p buffer. Isn't there a mistake in that wiring?

When you only cut the output, the delay chip is still recording what you play - you just don't hear it. So if you have a long delay happening, and you play something right before you turn the EB on, whatever you were playing into it before you activated it will be echoing when the EB is activated.

When you cut both in and out, you only start recording into the delay when the effect is activated.

[modallaire]

Does anyone see an obvious component that maybe fried, like D1 or something I should try first.

Most likely thing is D1 is the wrong way round, that would also explain why you got negative voltages with the polarity reversed, if D1 was correct it should have stopped that. Before you fire it up again I would remove all the ICs except the voltage regulator, power it up and make sure you get 9 volts across +9 and ground and 5 volts on pin1 of where the PT2399 goes.

Thanks, that solved one problem.  But I still don't have any delay. Bypass switch doesn't do anything.  I always have a clean signal with no delay.  LED does not come on either. I have performed voltage and audio tests.  Here are the results.

Pt2399                                              CD4066                                              U1                                   U3                                 7805
1 : 5V         16   2.5V                  1 :  4.5V          14 :  9.3V                    1 : 2V          8 : 8.7V          1 : 5V     8 : 9.3V      In 9V  G 0V  Out 5V
2 : 2.5        15   2.5                    2 :  4.5            13 :  9.1                       2 : 7.9         7 : 8              2 : 5       7 : 5       
3 : 0           14   0.08                  3 : 0.1             12 : 8.9                        3 : 5            6 : 5              3 : 5       6 : 5   
4 : 0           13  3.5                     4 : 0.05           11 : 4.5                        4 : 0.6         5 : 0.4            4 : 0       5 : 4.5
5 : 0           12  4.8                     5 : 0                10 : 4.5
6 : 4.2       11  0.9                     6 : 0                 9 :  0.08
7 : 4.2        10   2.5                    7 : 0                8 : 2
8 : 0            9  2.5


Audio : no signal (sometimes noise) except those noted below :

PT2399 pin 15 : clean signal  all other pins without signal

CD4066  Pin 1 and 2 : clean signal

U1 : nothing
U3  pin 1, 6 and 7 : clean signal
U3 pin 5 : clean signal + hiss noise


If anyone sees something that can help, it would help me greatly. 

Marc

Could someone find anything that could help me troubleshoot my pedal?  I heard the result with my pcb build and am eager to play with this one.

thanks anyway,

Marc

[jplebre]

Seems you have an issue with the CD0466. Pin 8 should be 9v.
I'm going through Slacker's reference chart posted at the beginning of the post.

Cheers
J

[slacker]

J's got it right, something is wrong round that part of the CD4066. Pin 6 has 0 volts on it which suggests the pedal is in bypass, but then pin 8 should have about 9 volts on it. More strangely pins 12 and 13 have about 9 volts on them, which they should only have if the pedal is on, but then pin 6 should also have 9 volts on it. I would check to see if pin 6 is shorted to ground, maybe to pin 7.

Something's not right with the PT2399 either which might explain why there's no delay, pins 11 - 14 should all be about 2.5 volts.

Check here for a full list of voltages http://www.diystompboxes.com/smfforum/index.php?topic=60662.msg498824#msg498824