SID monitor

[Mike(Mont)]

I can't help seeing the similarities between the Gold Gun and some of these SID monitors. One is called the Gyrator III and there are other older versions like this link. Merry Christmas!

https://www.aavso.org/files/gyrator1.pdf

https://www.aavso.org/gyrator-iii-vlf-receiver

[abdou2014]

Thank you Mr . did you try to build this circuit or modified it for gold hunting

[Mike(Mont)]

No, haven't built one and don't know if it would work for gold. An outfit called FarCircuits.net sells the PCB.

[abdou2014]

do you have a good circuit of pistol detector or any thing who working nice

[Mike(Mont)]

You're going to have to find someone who knows more about it. i am probably the least knowledgeable in electronics of anyone on this forum. With the PCB this project looks easy enough that even I could build it. Maybe it needs to be modified to find gold, I don't know. But somebody here probably can answer that.

[Mike(Mont)]

Don't know what I did wrong but the PCB image doesn't show. It worked before. I give up. I'd delete it but can't figure out that either. You can view the PCB at FarCircuits.net receivers

[Geo]

With some mods gyrator can locate long time buried objects.

[abdou2014]

Hello Mr GEO . can you help us for build one please

[Mike(Mont)]

With some mods gyrator can locate long time buried objects.

Power supply and antenna for starters?

[Seden]

Gyrator filters

Mike,

I know the Engineer that gave the author of the Gyrator receiver the idea of using a Gyrator. Phil Eide and I have been friends since 1982 and once in awhile get on 40 meters SSB. He used to work at Bunker-Ramo then Hughes Aircraft Missile Systems group in Canoga Park,CA. He's a real sharp practical Engineer. You can make some high Q filters with the Gyrator topology.

Randy

[Mike(Mont)]

Hi Randy. Yeah, those SID monitors are sensitive and I wonder why people around here are not interested. Guess they have too much invested in their own designs and don't like the idea of something so easy and inexpensive. I bought a Gyrator PCB but haven't built it yet.

[abdou2014]

Hi. i'm interested to this project .

[Mike(Mont)]

Well, I suspect you would need a rotary switch with different capacitor banks for each frequency you want. And like Geo says you probably will want a beep generator circuit to alert you when on a signal. Will it work? Geo says he doesn't think so. i don't know but it looks plausible, but I am not that skilled in electronics and never built a pistol detector.

[abdou2014]

Thanks. i have signal generator with loop antenna like transmiter and rotary switch . first i'll build pcb .

[abdou2014]

almost finished . which frequency you advise me ?