Delta Pulse

[kt315]

take old (first) schematic of DP or XR71 and make using it. do not take attention on my one
just cause you waste a time on the puzzles.

good luck camrade

[rankx0]

I have built Delta Pulse, but I have a problem - it works, sound changes when I turn pots, but it doesn't react to coil. Coil is OK, tested with another detector and it was working. Are there any oscillograms for DP around? Does anyone have a clue what to try to fix it?

[kt315]

all signals see post i answered recently #3156

[rankx0]

Thanks a lot!

[rankx0]

This is what I have at Tr2:

[kt315]

75us long? set PPS - for USA - 120Hz. what your country?

[rankx0]

I am in Serbia. This is the "on" impulse length, approx. 75-80uS, and distance between them is 9ms when I turn PR1 to minimum. When I turn it to maximum, I have 6.4mS.

[kt315]

for 100 PPS/Hz you must get 10ms in TR2, period. increase R1 if you can not set the value by PR1. pulse length is ok.

[rankx0]

OK, I have changed 680k to 820k and now I can adjust period to 10mS using PR1. I must get second probe, so I can compare test points, so I will post when I do it. Do you have any clue what is going on, why it doesn't react to coil? This is graphic for my Tr3, period is 10mS, but impulse length is 60uS.



When I rotate Depth / Noise potentiometer, I can set it to 100uS. Is it OK?

[rankx0]

Impulse width at Tr4 is ~45uS. The same widht is at Tr5.

[kt315]

OK, I have changed 680k to 820k and now I can adjust period to 10mS using PR1. I must get second probe, so I can compare test points, so I will post when I do it. Do you have any clue what is going on, why it doesn't react to coil? This is graphic for my Tr3, period is 10mS, but impulse length is 60uS.

[ATTACH]38572[/ATTACH]

When I rotate Depth / Noise potentiometer, I can set it to 100uS. Is it OK?

not ok. you have to get approx 100-500 us range.

[kt315]

Impulse width at Tr4 is ~45uS. The same widht is at Tr5.

good

[rankx0]

I have tested Tr3 and I have 60-350us range when I turn Depth pot from min to max. What do I have to change to get 100-500 us here? I tried to simulate those two vibrators, and in simulator R5 must be set to 4k2 and C3 to 22n to achieve 100-500us range with 20k Depth potentiometer. Should I change them that way, or there is another thing to do?

[rankx0]

Now I tried to change R5 and C3 as above, and this is what I get with Depth on minimum:


This is what I get with Depth on maximum:

[rankx0]

And with another coil (280uH), I have those values - almost perfect.