### Author Topic: Dimension P - New PT2399 Chorus  (Read 86684 times)

#### bluebunny

##### Re: Dimension P - New PT2399 Chorus
« Reply #100 on: March 09, 2023, 04:05:58 PM »
All the schematics were re-posted just a few centimetres above your post, Benoit.
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#### Kevin Mitchell

##### Re: Dimension P - New PT2399 Chorus
« Reply #101 on: March 09, 2023, 04:24:42 PM »
All the schematics were re-posted just a few centimetres above your post, Benoit.
Marc's home office

Only foolin'.
I didn't even know this project existed! Looks interesting!
« Last Edit: March 09, 2023, 04:51:12 PM by Kevin Mitchell »
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#### bluebunny

##### Re: Dimension P - New PT2399 Chorus
« Reply #102 on: March 10, 2023, 03:24:24 AM »
If only my home office looked that neat...
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#### Phend

##### Re: Dimension P - New PT2399 Chorus
« Reply #103 on: March 10, 2023, 11:34:28 AM »
Looks like my next build, thanks much. Fuzzed out at the moment, (ha never).
But a few questions on the circuit v1.1 modded.
1) Will 1n914 work in place of 1n4148 ?
2) The 1/2 voices switch and dry on/off switch.  Are these two separate SPST switches ?
3) Beginner question about TL072 pinout numbers, I see the two halves.
Are these number correct ?
Starting at the right tit and going CCW.
U1a : 1 , 8, 2, 5, 4 (gnd)
U1b : 7, 6, 3 (5v)
Regards
Paul

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#### Kevin Mitchell

##### Re: Dimension P - New PT2399 Chorus
« Reply #104 on: March 10, 2023, 12:01:53 PM »
Looks like my next build, thanks much. Fuzzed out at the moment, (ha never).
But a few questions on the circuit v1.1 modded.
1) Will 1n914 work in place of 1n4148 ?
2) The 1/2 voices switch and dry on/off switch.  Are these two separate SPST switches ?
3) Beginner question about TL072 pinout numbers, I see the two halves.
Are these number correct ?
Starting at the right tit and going CCW.
U1a : 1 , 8, 2, 5, 4 (gnd)
U1b : 7, 6, 3 (5v)
Regards
Paul

1) yes, every time you see 1n914 you can use a 1n4148 instead
2) I'd say yes they are two SPST switches. Otherwise you wouldn't be able to set it to the default unmodded format. But really it would be better to use a single DP3T switch to handle both - I'd guess that was the original thought.
3) Best to view a dual opamp schematic as 3 sections. Channel A, B and power. There's nothing special about channel A vs channel B, as long as they are wired properly against the schematic (pos in, neg in & output).
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#### Phend

##### Re: Dimension P - New PT2399 Chorus
« Reply #105 on: March 10, 2023, 03:30:04 PM »
Thanks Kevin,
So use 1n914 instead of 1n4148
And using 1/2 and other 1/2 of TL072 becomes:

Correct ?, (sorry for being slow)
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#### Kevin Mitchell

##### Re: Dimension P - New PT2399 Chorus
« Reply #106 on: March 10, 2023, 04:52:42 PM »
So use 1n914 instead of 1n4148
Oops I had it backwards. But yeah those diodes are interchangeable. This is a popular notion.
Opamp pinouts look good!
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#### Phend

##### Re: Dimension P - New PT2399 Chorus
« Reply #107 on: March 10, 2023, 05:16:15 PM »
Great, thanks Kevin, plus I have an on on on dpdt switch from a previous build order.
Always always buy a few extra of those low cost components, you will find a way or need to use them.
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#### bluebunny

##### Re: Dimension P - New PT2399 Chorus
« Reply #108 on: March 10, 2023, 05:23:13 PM »
I've built this three times.  I used two SPSTs for the dry/wet and 1/2 voice options.  I've got one in the pipeline with a 2P4T rotary, just to confuse things a little.
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#### Phend

##### Re: Dimension P - New PT2399 Chorus
« Reply #109 on: March 10, 2023, 05:35:48 PM »
Darn, no more changes

« Last Edit: March 10, 2023, 05:38:31 PM by Phend »
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#### bluebunny

##### Re: Dimension P - New PT2399 Chorus
« Reply #110 on: March 11, 2023, 06:23:35 AM »
To assuage Paul's despair, the 2P4T is a solution to a problem (steel enclosure with three pot holes pre-punched - I ain't drillin' me no steel!).
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#### Phend

##### Re: Dimension P - New PT2399 Chorus
« Reply #111 on: March 11, 2023, 06:33:43 AM »
Does the 4th position turn both sws to off ?
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#### Phend

##### Re: Dimension P - New PT2399 Chorus
« Reply #112 on: March 11, 2023, 09:51:35 AM »
I'll pass , Amazon has these , no idea what the gift card deal is about

« Last Edit: March 11, 2023, 09:55:35 AM by Phend »
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#### bluebunny

##### Re: Dimension P - New PT2399 Chorus
« Reply #113 on: March 11, 2023, 12:05:39 PM »
Does the 4th position turn both sws to off ?

Yes.  So you have:

voices |   dry on    |   dry off
2   | rich chorus | weird vibrato
1   | thin chorus |    vibrato
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#### Phend

##### Re: Dimension P - New PT2399 Chorus
« Reply #114 on: March 11, 2023, 02:37:48 PM »
I won't pass, will get a 2P4T rotary.
Connect center A B pole pins to "out"
Connect 2 adjacent pins on one side to R23 (dry)
Connect 2 middle pins on the other side to R24 (voices)
Four other pins have nc
Simple enough if my "assumed" hand drawn diagram is correct.
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