Replies to Minipulse Plus

[Qiaozhi]

Today I tried a matched set of caps for c13 and c14 470nf Matched both to within 300pf and couldn't really notice any difference. No joy to be had. Measured old ones and they were 451nf and 435nf.

I'm pleased that someone has tested the matched cap argument in practice. Personally I've never found any "detectable" difference (pun intended).

[josewashere]

Great work! Do you have a plain circuit diagram for the GB mod? and were it connects to the existing circuit? In my day we just used spice on the roast chicken lol.

Today I tried a matched set of caps for c13 and c14 470nf Matched both to within 300pf and couldn't really notice any difference. No joy to be had. Measured old ones and they were 451nf and 435nf.

[WM6]

Until now, no one can be better than Delta Pulse Pulse, whether or stability detection range, so for the average DIY, I think the best option is delta pulse

Delta pulse follow brute force logic and you need your own power plant to supply it. This is why I dont like it.

I prefer PI constructions like old Fisher Impulse design, one set of battery last for 100 hours.

If Davor successfully finish all his MPP improvement ideas, this could be one of most complete PI design.

[liudengyuan]

Incremental pulse best choice

[joop]

Have you compared Delta Pulse to Minipulse Plus? What makes you say it is better?

[liudengyuan]

Until now, no one can be better than Delta Pulse Pulse, whether or stability detection range, so for the average DIY, I think the best option is delta pulse

[6666]

Please send me photos of your MPP, so that I can include them in the Completed Projects thread.

Yes happy to when fully working.

[Qiaozhi]

Great work Davor my MPP has developed some sort of fault got to debug it, but will try to make your GB project asap.

Please send me photos of your MPP, so that I can include them in the Completed Projects thread.

[6666]

GB circuit works! I made it on a protoboard together with a 555 generator to mimic real world timing, and I only skipped trimmers to avoid clutter - fixed values are OK for the proof-of-concept. Anyway, the timing works as it should. The next step is to place the components onto a perfboard and hook it to its proper places.
The attached files are as follows:

1. the corrected schematic using simple NAND CD4011 instead of a slightly unpredictable CD4093, and taking control over Schmitt trigger by means of simple resistors
2. CRO photo of a same thing in jpg format - obviously working as advertised
3. same thing, only as a zipped LTspice folder

Great work Davor my MPP has developed some sort of fault got to debug it, but will try to make your GB project asap.

[Davor]

It is completely disassembled at this moment. I'll put everything on a perfboard one of these days, but first I'll have to make a MPP work without it. It is populated (Ivconic style, but with IC sockets) and I have a coil, so it will be soon.

[Qiaozhi]

GB circuit works!

Do you have this connected to a Minipulse Plus, or is it just standalone at the moment?

[Davor]

GB circuit works!

GB circuit works! I made it on a protoboard together with a 555 generator to mimic real world timing, and I only skipped trimmers to avoid clutter - fixed values are OK for the proof-of-concept. Anyway, the timing works as it should. The next step is to place the components onto a perfboard and hook it to its proper places.
The attached files are as follows:

1. the corrected schematic using simple NAND CD4011 instead of a slightly unpredictable CD4093, and taking control over Schmitt trigger by means of simple resistors
2. CRO photo of a same thing in jpg format - obviously working as advertised
3. same thing, only as a zipped LTspice folder

[Silver Dollar]

Ahh I see you need to find the resonant frequency and then
back calculate the capacitance. I don't have anything to do
that with at this time. Once I get a PI detector running I can
pulse the coil and see what frequency it rings at.

[Silver Dollar]

the diameter is 7.5" or 19cm. How do you measure the capacitance?

[CAS]

I just ordered a PCB. Here's my BasketWeave Coil. It measures 320uh and 1.5 ohms.
I'm hopeing it shields itself via the outer windings. I just drilled alternating holes approx.
the size of 6 or 8 wires. If you look close I had to add an extra row as the wires take
more space when wound. I don't have a working PI to try it on yet but soon.

[ATTACH]30887[/ATTACH]

What diameter did you make that coil and approx how many turns of wire? Any idea on what capacitance it turned out to be?