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Rebote 2.5 delay. Are capacitor values critical?? SOLVED!!
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mubase



Joined: Mar 24, 2011
Posts: 110
Location: London UK
Audio files: 5

PostPosted: Tue Apr 09, 2013 9:44 am    Post subject:  Rebote 2.5 delay. Are capacitor values critical?? SOLVED!! Reply with quote  Mark this post and the followings unread

Hi all. I have just built the stripboarded version of the rebote delay as shown in the attachment.
I didn't have any 82nF caps so I used 100nF instead. Also the 27nf is a 22nf and the 51pf is a 56 pf.... would this stop the delay working??
Also I used a 220K resistor instead of the 240K . as with the 24K resistors, I used 22K...
Would anyone know if the cap values are critical?
I can say I tested it and am getting an output which tells me that the tl072 op amp is working but there is no delay? The delay and repeat pots don't seem to do anything and the DPDT switch also has no effect..
Any help appreciated greatly.
Thanks,
Steve.


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Last edited by mubase on Thu Apr 18, 2013 2:25 pm; edited 1 time in total
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capicoso



Joined: Nov 19, 2012
Posts: 127
Location: Argentina

PostPosted: Tue Apr 09, 2013 1:18 pm    Post subject: Re: Rebote 2.5 delay. Are capacitor values critical?? Reply with quote  Mark this post and the followings unread

MuBase wrote:
Hi all. I have just built the stripboarded version of the rebote delay as shown in the attachment.
I didn't have any 82nF caps so I used 100nF instead. Also the 27nf is a 22nf and the 51pf is a 56 pf.... would this stop the delay working??
Also I used a 220K resistor instead of the 240K . as with the 24K resistors, I used 22K...
Would anyone know if the cap values are critical?
I can say I tested it and am getting an output which tells me that the tl072 op amp is working but there is no delay? The delay and repeat pots don't seem to do anything and the DPDT switch also has no effect..
Any help appreciated greatly.
Thanks,
Steve.


Hey, the values are close except for the 82nf. But this shouldn't make it stop working. Remember that caps can have up to 20% of tolerance so...
I built a pt2399 delay and didn't have some values and changed caps and nothing wrong happened.
Did you recheck everything already? The mix pot works ok?
Check that your pt2399 is working ok. Is it getting 5v?
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mubase



Joined: Mar 24, 2011
Posts: 110
Location: London UK
Audio files: 5

PostPosted: Wed Apr 10, 2013 11:09 am    Post subject: Rebote 2.5 delay. Are capacitor values critical??
Subject description: mmm..
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Hi! Thanks for the reply.
I've checked the PT2399. Its getting 5 Volts.
The mixer pot turns volume of input up & down but apart from that, nothing..
When I turn the mix pot all the way down it causes a "Click".. in the audio output.... ??

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Boogdish



Joined: Sep 21, 2009
Posts: 122
Location: Bloomington, IN

PostPosted: Sat Apr 13, 2013 10:39 am    Post subject: Reply with quote  Mark this post and the followings unread

Double check that you've cut all the traces you were supposed to on the strip board and that your jumpers aren't shorting to anything.
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mubase



Joined: Mar 24, 2011
Posts: 110
Location: London UK
Audio files: 5

PostPosted: Thu Apr 18, 2013 2:24 pm    Post subject:  rebote 2.5 solved!!!
Subject description: works now & i am very happy.
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Not to worry. I got another PT2399 chip , inserted it and now it works. Smile
Blindingly good delay. I've changed the 15K resistor on the DPDT for a 4.7K and get a really nice infinity feedback.
So the board was OK but the chip was at fault.
No problemos.
Thanks for the helpz.
Smile
Smile
Smile

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