AquaBoy Deluxe MN3008 or v3205 Version - no Delay in the Mix...

[zombiesonore]

Hello everyone,
I'm French so please excuse my poor English.

First, I would like to thanks Madbean for putting so many great DIY projects! I've build many of them and they're all awesome.

Now, I've tried to build the AquaBoy Deluxe. I've order 2 MN3008 and 2 v3205 so I have the choice. I used both with MN3101 clock.
After having trouble with the MN3008 I switched to v3205. But now, I think the problem is not here.
The problem is: there's delay sound on IC4 pin 3, but none on the output of the board, just clean sound.
I think of a mix problem or a feedback problem.
I've triple checked everything. I've checked resistors/diodes/pots/trim values. I don't know where to start looking for.
So, if anyone have any idea, I take it!
Thanks!

Etienne

[Christof]

Those are quite different chips, swapping them you may be replacing one problem with another, unless you are changing the power supply jumpers under IC3 to suit each chip as well.
When running the MN3008 (jumpers etc set to suit), did you have D3 in the circuit? D3 needs to be left out with the MN3008, otherwise there will be no delay.

[zombiesonore]

Thanks for the answer!

Just to confort you, I've started with the MN3008 version and then I've changed the necessary components for the v3205.
I've stayed with the mn3001 for the clock because I've read a report which said that it works. I've changed the jumper and add D3, D2, and changed some resistors values.
Anyway, I have sound on pin 3 of both of v3205 chip. There's something I don't get...

[Scruffie]

Take voltage readings of all the ICs and Transistors and post them please.

[zombiesonore]

Let's go!

IC 1:
1# 4.39  8# 8.80
2# 4.39  7# 4.39
3# 4.36  6# 4.39
4# 0     5# 4.37

IC 2.
1# 1.01  16# 0.12
2# 1.79  15# 1.79
3# 1.79  14# 1.79
4# 0     13# 8.81
5# 1.80  12# 1.80
6# 1.77  11# 4.87
7# 2.94  10# 4.86
8# 1.80   9# 1.80

IC 3:
1# 0      8# 7.23
2# 3.47   7# 3.92
3# 5.01   6# 3.99
4# 5.04   5# 7.94

IC 4:
1# 0      8# 7.22
2# 4.00   7# 2.99
3# 5.27   6# 3.99
4# 5.30   5# 7.85

IC 5:
1# 7.93   8# 7.22
2# 3.97   7# 3.85
3# 0      6# 0
4# 4.01   5# 3.77

IC 6:
1# 4.41  8# 8.80
2# 4.41  7# 4.41
3# 4.20  6# 4.42
4# 0     5# 4.42

Q1:
C 8.78
B 2.68
E 3.14


Q2:
C 8.78
B 2.80
E 2.31


Q3:
C 8.78
B 5.04
E 4.62


Q4:
C 8.81
B 0
E 0


And... that's it !

Thanks Scruffie.

[Scruffie]

There's a problem with Q4.

Also your compander pin 7 voltage is low, adjust R13 & 14 until it gives half supply.

Edit: Adjust R13 & 14 in equal intervals.

[zombiesonore]

Okay, thanks a lot!
I'll do that tomorrow, it's past 2 am now...

When I probe the voltage, I thought that something was wrong with Q4, so I'm not THAT dumb...

[zombiesonore]

Hi everybody,
this *!??!* delay is working!
Scruffie, thank you so much, you saves me so much time and pain! Q4 was guilty.
Also, I've 5.5V on the pin 7 of the compander, is that too much? should I try to get 4.5V ?

Now I have my first home-made Analog Delay, I'm so happy! Again thanks Madbean to give us this kind of project: feasible!
I have the v3205 version working so I guess I will play with it a while and them make work the mn3008 version.
Scruffie (from Futurama?) : thanks, thanks, thanks ( * 1000) !

Etienne

[zombiesonore]

I've build the MN3008 version.
Amazing, simply amazing!
I've owned a Maxon AD-9 and I can't hear any audio quality difference, and with the aquaboyDX, there's modulation!
I'm dazed... 

[Scruffie]

Hi everybody,
this *!??!* delay is working!
Scruffie, thank you so much, you saves me so much time and pain! Q4 was guilty.
Also, I've 5.5V on the pin 7 of the compander, is that too much? should I try to get 4.5V ?

Now I have my first home-made Analog Delay, I'm so happy! Again thanks Madbean to give us this kind of project: feasible!
I have the v3205 version working so I guess I will play with it a while and them make work the mn3008 version.
Scruffie (from Futurama?) : thanks, thanks, thanks ( * 1000) !

Etienne

Congrats, glad you got it going

Half your supply voltage on pin 7 will give you the best headroom, it's up to you if it's currently acceptable or not.

No Scruffie isn't from futurama (His name is spelt Scruffy anyway) but it's nice when things work out.

[zombiesonore]

Hi,
I was wondering: I've seen at smallbear that we can use 2xMN3008 to get 1xMN3005. Is it possible with the aquaboy? Is there any electric power problems?
Anyway, a friend of mine who is a great musician from Argentina came yesterday and tried the aquaboy, he was amazed too and it was a beautiful musical moment.
Now I've the hardbingerOne and the LowRider and the Quadrovibe and the ... and the ... to build!
Thanks again,
Etienne

[Scruffie]

Yes you can use 2 x MN3008 for 300mS of delay and it will be effectively the same as 1 x MN3005.