volksturm opt1- power supply

[Bonzo]

Hi
I build me detector volkstrum opt1.
Can you me say how choose resistor noted on small picture?
Does it this get on maximum the amplitude connecting the oscylokop to 7 pinu of converter?
I put in in place this resistor (RX) potentiometer 22k, amplitude regulating grows and falls, but after crossing sure value no longer grows - whether I for border this value have just to choose resistor?
Foto:
http://zapodaj.net/a4354901a31b.jpg.html

[Bonzo]

?

[kt315]

Bonzo,

thank you for attention to the project. here is new circuit. this power supply is more advanced. but not still tested. you can also try to use widely famous MC34063 as step-up converter. or use what you can find around... Sturm is not limited project in variations and more soft universal than anything there.

[Bonzo]

so I understand,
However in original patern how you chose value noted resistor. Did you do on maximum of amplitude this? Can it on her definite value?

[kt315]

a practice says 7660 is not effective for low voltage converter. as it is in this case. ie you will get big voltage drop. if you hope to get -5V you will get only -2,5V. otherway for big respecting voltage level 7660 is really effective.

[kt315]

Sturm-III. remember - it is only a project, still not tested. VS has not already existed.

[Bonzo]

Can you me say how check when resistor 10k liable for is the synchronisation of frequency of inverter well-chosen correctly?
It the measurement has to be accomplished with frequency meter among gnd and -5V?
How do to get to know when resistor is for small or for large?