Messages

  Hi guys

I just finish to build a Stage Fright Phaser and it work strange (that always for me This kind of thing lol) the phaser work good 2 or 3 seconds and after, clean signal... 
That the same in all positions : 5 or 6 stages and the trim change only the deep of the phaser normaly. The lfo work good (led ok).The phase stages are in normal mod (1nf) and i soldering 3,3nf cap (not trying without...) The pcb is clean and my solders're good.

I have some ideas : maybe power problem (i use 9v dc 250ma) normaly that enough.
When i turn off and on the power, it work again 2 seconds, just like a dicharging condenser... Mabye LM13700N problems but why ? i take care with electrostatic...

If you have some idea... 
Thanks guy !! 

Ps : i'm french sorry for my bad english

  Ok the delay full work, see in this post :
http://www.madbeanpedals.com/forum/index.php?topic=10638.msg97540#msg97540

  Nice job ! I'll try change soon the clock IC, thanks.

Edit : I change mn3202 with 3201 and recalibrate and full work thank's all !

No that's the same with D3 and/or change R55 value, i think it's maybe a probleme with the clock to "start" the bbd sequency, the vgg voltage is 7,7v. i think that because when i turn up the delay pot to high frequency clock and turn on power, all the time the delay start and work at all frenquency clock after.thanks for your help.
Edit : i have a good square wave signal, saw with scope.

Thank's
I have the same problem of you, and i find a rapid issue for the moment : i turn on two time the delay with a the second time a high clock and it work fast, don't need to wait.
I'll try to reduce or jumper R55 and/or R27, maybe the BBD need a higher signal and/or a high frequency clock (normaly not it can turn on at the lowers frequency clock) for "engage" the delay. Or more current for bias. 

Edit : from Aquaboy PDF : R55 and R27:

"... You may also notice that large resistors  here wi l l pro vide additional current limiting from the two Bias trimpots. If
you are having trouble achieving the correct bias via the tr impots with R55 and R27 then reduce R18 and R26
respectiv ely. This did not seem to be an issue on the prototype builds."

Hi, all  

I build a Aquaboy deluxe with 2xmn3205.
I would like to say thanks for the very good quality of the PCB.
i calibrate the clock at 7khz for the max delay time and adjust the output of the bbd with scope and a sin wave 500hz 0.6v rms, for the best lower distortion.
I use mn3102 for the clock and a zener 8.2v for d2 and "empty" d3
i use 100k resistor for R55 and 470k for R27  and i have all the time a very clean signal.

There is just something strange :
sometimes when i turn on the power i have no delay and no signal at the output pins of one bbd.
i turn off the power and move the delay time control up and turn on again and that work...
At the start i put this bbd in fisrt and after i change it to second position.  i have all the time the delay signal with the other bbd...
That not critical because it sound very good but That very strange...
Maybe this bbd is fake or work bad but when it work it sound good... If you have a idea....

thanks.

Edit : sorry i post a new topic and there is a similar probleme here ? http://www.madbeanpedals.com/forum/index.php?topic=10638.0