SBG- slow motion metal detector

[pechkata]

It's all a matter of compromise. In soil with ore, you work with a worse Q factor. Unfortunately, the sensitivity is worse.

[scs-bg]

It's all a matter of compromise. In soil with ore, you work with a worse Q factor. Unfortunately, the sensitivity is worse.

[scs-bg]

Sorry, "Q" factor. Typing error.

[scs-bg]

It doesn't matter whether the resonance is sequential or parallel. I hope you know what K factor is. I'm not going to become a teacher. Many fortune tellers have appeared on this forum. I don't want to deal with fables. In Bulgaria, everyone is competent in computers, women, brandy, politics and metal detectors. Do what you like. But first do, and then teach people!

[pechkata]

This scheme.

[pechkata]

https://www.youtube.com/shorts/FUa8om4co3A

80 volts peak.

[pechkata]

First steps.

[pechkata]

This is the generator in reality. I took a picture so that there are no disputes and doubts. I am not angry with the young man from Turkey. No one knows everything when he is a beginner. He should not rush without checking everything. In the schemes, every detail is important. I have good friends from Russia and Turkey. They are people with great potential.

Yes, it's a very good oscillator - but it's a sequential oscillating circuit.
There is an air-ground difference.
He's good at the beach.

[ivconic]

But the greater wisdom of life lies in the simple fact; who does not inhale a lot of white smoke - he will never learn Electronics enough!

[ivconic]

My (AI) caricatures should not be taken seriously but only as a humorous illustration.
I'm currently in the "crazy AI drawing" phase.
This is a temporary state, I'll go back to normal when I get bored of AI drawing!

[scs-bg]

This is the generator in reality. I took a picture so that there are no disputes and doubts. I am not angry with the young man from Turkey. No one knows everything when he is a beginner. He should not rush without checking everything. In the schemes, every detail is important. I have good friends from Russia and Turkey. They are people with great potential.

[ivconic]

[ivconic]

My pcb is on the way, it'll take 10-15 days to arrive.
This is just one testing pcb done by my colleague from China.

[ivconic]

No harm done, pcb remains the same:

[scs-bg]

TurkAlperenebeg
Junior Member

• Join Date: May 2026
• Posts: 13

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#122
Today, 06:41 PM


Hello! I am a 12th grade student at a technical school in electronics. We noticed discrepancies between the board and the schematic diagram, especially in the generator part. There, the two capacitors in the bases must be short-circuited, otherwise the transistor mode will not allow generation. We have not checked the board in detail, in this regard we trust you. Some annotations on the picture of the diagram I sent are details - to identify potentiometers, switches and others that will be placed on the front panel. Thank you very much for your interest! All the best! After I construct the device, I will send you a review







Dear friend, electronics is a complicated thing and nothing is done there with assumptions or beautiful drawings. If you short-circuit the capacitors, the voltage on the bases of the transistors will be about 0.4 volts and they will be blocked. You are still young, you will learn many more things. I wish you to become a good specialist.