Hi guys, I'm attempting to build my own VLF detector. Well, almost homemade. I did have to buy the search coil. I tried for awhile to wind my own coil, but decided to buy the Excelerator EQ2 coil. I've been working on my circuit, but I can't seem to get a good detection signal on the Rx side of the coil. In order to get a good signal of about 100+ mV peak to peak, I have to put a big piece of metal inside the ring. Normally when there is no metal around the coil I see about 20 mVp-p.
Can you guys help me understand the secret? I've varied the frequency. I also varied the parallel capacitor across the Rx coil. Nothing seem to help to be able to detect metal unless I'm right in the coil ring.
I'll see if I can attach my schematic here. I hope to be able to share my work with everyone as I build this circuit. But I'm really stuck right now.
Can you guys help me understand the secret? I've varied the frequency. I also varied the parallel capacitor across the Rx coil. Nothing seem to help to be able to detect metal unless I'm right in the coil ring.
I'll see if I can attach my schematic here. I hope to be able to share my work with everyone as I build this circuit. But I'm really stuck right now.
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