Messages

So finally I have changed the BL3102 clock to MN3101. The BL made a crazy clock sign...
This way it works nicely! Problem solved.
ps.: maybe the BL3102 was fake or I do not know... I have tried two of them from the same stock.

Hi Measbean!
You may find something about the BL3208 issue?
Best, dizso

Thanks for your help!
No hurray, i am busy with my work during the weekdays, i can work on the delay at the weekend...

C33 is 100p silver mica. So hopefully it works properly.
According to the data sheet the BL3208 waiting for 10-100 kHz. So why it is wrong?
Should i reduce C33?

The distortion is somewhere in the circuit, the dry signal is muted.
I tried with two BL3102, but i have not tried with MN3101. I need to find one...
Do you think, the clock can cause the problem?
Before the BBD the sign looks good (by ear), after the BBD is distorted, the higher voices more.
The clock was measured by scoop: it varies between 10-100 kHz.

so, now i could have measured some voltages:
BL3208
pin 8 (Vgg) - 8.2V
pin 5 (Vdd) - 8.8V
pin 7 (In)   - 5.7V
BL3102
pin 1 (Vdd) - 8.8V
pin 8 (Vgg) - 8.2V

It is 8,98V at vDD.
Which else can be interesting?

Some more experiment: just at the output of the BBD it is very noisy even in the best position of the "cancel" pot. In the deep frq it is not very ditorted, but the heights (the middle of the E1 string) is just a hash,  not a real sound.

Hi!
I am working on Aquaboy with chip BL3208. And it is very distorted. It is ok until the input of the BBD, but the output of the BBD is very noisy and distorted.
I tried the next:
- biasing
- reduce the input level before the compander
- reduce the input level before the first filter transistor
- adjust the symmetry after the BBD
If the clock generator is reduced to minimum and there is no delay, it is not noisy and distorted...
Any idea? Thanks for any help!