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Thanks Malcolm Lear !

A

Anonymous

Guest
Hi Malcolm and all,
Thanks for this Russian website I didn't know about. I found the DeltaP (Delta pulse) to be of interest. I think it shows what Eric was talking about using diodes and sharing the cap and resistor to two monostable multivibrators (one shots) to keep the first and second sample width more are less the same. On my fully adjustable bench step up I actually use the same one shot for both samples, which can be achieved with a few logic gates and a flip flop.
The analog chain on this design is most interesting. Appears to me to be a direct coupled no motion required design, where he is auto nulling the offsets of the amplifiers during the transmit on period. Least thats what it appears he is doing thoughout this chain. But I could be wrong. Anyone else have any comments on this design? Anyone tried this front end amplifier scheme? Or any of the rest of it. Going to have to look at this one a bit longer than most, trying to figure out the up side, down side of what is being done here. Maybe some good ideas for the free design? We should be able to come up with something a bit better than the basic. Maybe several different analog designs.
JC
 
The Deepstar Pro at the top of the list is not my Deepstar. It appears to be a 1970's design from the 2N3055 TX, single ended integrator and power supply arrangement.
I see that the XR71 also uses the diode arrangement on the two sample generators.
Eric.
 
Hi Eric,
I was wondering if this could be your Deepstar, but then after all the positive things said about it, it didn't seem possible.
Anyway, some good schematics to ponder over. The White's PI patent number 5414411 I believe goes with the White's PI 1000 detector to some extent. Those wishing to learn more of the basics of PI might wish to read this patent (Carl's site) and review the schematic (the Russian site).
JC
 
Hi Eric,
After further investigation, it appears that the Delta pulse and the XR71 is virtually the same schematic, except the topology on the xr71 is really hard to follow, and it has a meter.
Anyway, these may some neat analog blocks to drop in the designs.
JC
 
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