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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Adding Ghetto Echo to the Lunetta
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Draal



Joined: May 18, 2010
Posts: 305
Location: Oak Park, IL
Audio files: 5

PostPosted: Thu Apr 03, 2014 9:44 am    Post subject: Adding Ghetto Echo to the Lunetta
Subject description: Buy a cheap pt2399 echo pcb
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I bought a dirt cheap prebuilt pt2399 ech pcb online for under 12 US bucks shipped from Bulgaria. Neat and tidy pcb with simple hookups for power and in/out points. It's not hardwired yet as I want to tweak a few things but she's fully operational and a hoot to play with.

The trim pots control the delay time and wetness of the effect and it is similar to most of the overpriced delays on the market using the pt2399 chip. I need to read up a bit more on it but adding cv input shouldn't be too much trouble and worth the time. Full sized pots are a must too.

All in all, a great way to experiment with echo without breaking the bank.


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DUBmatze



Joined: Feb 18, 2013
Posts: 122
Location: south Germaica (schwabilon)

PostPosted: Fri Apr 04, 2014 1:02 pm    Post subject: Re: Adding Ghetto Echo to the Lunetta
Subject description: Buy a cheap pt2399 echo pcb
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Draal wrote:
I need to read up a bit more on it but adding cv input shouldn't be too much trouble and worth the time.

phobos added a Cv to Pin 6 of the pt3299:
Posted Image, might have been reduced in size. Click Image to view fullscreen.
your "ghetto pcb" looks like it have a very low parts count... (without any op amp)...
...maybe one day you in the moods and paint the schematic to share Wink
i like it simple, this is my version:
Posted Image, might have been reduced in size. Click Image to view fullscreen.
btw in my wordl - delay is the most important FX Wink

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Draal



Joined: May 18, 2010
Posts: 305
Location: Oak Park, IL
Audio files: 5

PostPosted: Fri Apr 04, 2014 1:42 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for the schematics Very Happy . That transistor on the tail end of the delay pot on pin 6 is just perfect.

Here's some pics of the pcb I bought. I already replaced the smd 10k resistor (pin 6) and trim pot with a 100ohm resistor and 50k full sized pot. From what I have traced so far, this is a standard echo based right off the pt2399 data sheet. No frills but gets the job done Cool .


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nathanxl



Joined: Apr 24, 2012
Posts: 73
Location: Wa

PostPosted: Sat Apr 05, 2014 6:25 am    Post subject: Re: Adding Ghetto Echo to the Lunetta
Subject description: Buy a cheap pt2399 echo pcb
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Draal wrote:
I bought a dirt cheap prebuilt pt2399 ech pcb online for under 12 US bucks shipped from Bulgaria.>


Any chance for a link to where you bought this?
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Draal



Joined: May 18, 2010
Posts: 305
Location: Oak Park, IL
Audio files: 5

PostPosted: Sat Apr 05, 2014 8:23 am    Post subject: Reply with quote  Mark this post and the followings unread

Here ya go:
http://www.ebay.com/itm/PT2399-Digital-Echo-KIT-Built-and-tested-/111273118649?pt=US_Ham_Radio_Transmitters&hash=item19e8650bb9


He has a few left apparently Cool .

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animalman



Joined: Jan 21, 2013
Posts: 10
Location: out past midnight

PostPosted: Thu Apr 10, 2014 6:29 am    Post subject: Reply with quote  Mark this post and the followings unread

yeah some delay really makes everything sounding sweet.
I've tried this "ERSATZ VERBEN"simple reverb/delay and with some tweeking of the pots it sounds great for such a simple build.
That site is an endless well of good stripboard FX designs
http://tagboardeffects.blogspot.se/search?q=ersatz

it is a bit sensitive about levels of the input though. Does adding some buffer help this?

And a really cool thing is to put a photoresisor on the delay-time-pot for
some wavy seasickness
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elmegil



Joined: Mar 20, 2012
Posts: 1524
Location: Chicago
Audio files: 14

PostPosted: Thu Apr 10, 2014 6:38 am    Post subject: Reply with quote  Mark this post and the followings unread

This might help for levels:

http://cgs.synth.net/modules/cgs60_sba.html
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