One-Coil SG 3D

[DMANN]

It looks like a simple diode (1n4001) is used. ref: page 35 of the Bedini SG Handbook Intermediate

[DMANN]

So I have a couple of these 555 modules coming in today. https://www.youtube.com/watch?v=BHFO2-gmX5Y & https://www.youtube.com/watch?v=97CU7WszMO0
I'm following through with the plan to charge the primary while the flywheel spins it using the 555/mechanical relay circuit that JB gave Watson. I was wondering how important it would be, if I am running this circuit from the primary, to isolate it somehow? How did Watson isolate this part of the circuit? I was thinking about using a cell phone charger to accomplish this. My thinking is that the impedance from the transformer in the phone charger will keep the voltage spike from entering that circuit.

Doug

[Faraday88]

I think you are quite right. I was expecting a green layer of a salt. Do you reckon dunking them in a gloss paint is the better move to cut down eddy current issues?

Hey,
Yes enamel coat is the best way to do it you may dip them in transformer varnish ..but allowing it to rust it in open is free and the best..
Rgds,
Faraday88.

[wrtner]

this would corrode the rod too much..
Rgds,
Faraday88.

I think you are quite right. I was expecting a green layer of a salt. Do you reckon dunking them in a gloss paint is the better move to cut down eddy current issues?

[Faraday88]

An excellent idea, RS. A squirt of lemon juice might be a good idea.

this would corrode the rod too much..
Rgds,
Faraday88.

[wrtner]

An excellent idea, RS. A squirt of lemon juice might be a good idea.

[wrtner]

An excellent idea, RS. A squirt of lemon juice might be a good idea.

[RS_]

Soak them in water for a day or so, till they form a patina (rust) on the copper, let them dry, and you have natural insulation from the copper patina. JB told me about doing this early on.

[wrtner]

When compiling the core out of 1.6mm dia R45 welding rods, copper coated, is it a good idea to dip them in paint or varnish to reduce eddy currents?

[Faraday88]

These are the magnets that I used for this project: https://www.harborfreight.com/2-piec...cks-98406.html They only have a 3lb pull force. They are adequate enough to activate the transistor via the trigger coil. I'm not sure if they are C8, but they are only 99 cent right now for a 2-pack. They are easily sourced as long as you have a HF in your area.

I've used circle ceramics before. They worked. I don't think that it matters too much what the shape of the magnet is that you use. The only one that you may have trouble with is a ring magnet when using a trigger coil. The abrupt nsn or sns that you get with a ring magnet is where the trouble comes from.

Hi DMANN,
The face of a Magnet is where the lines of force are normal to its surface. in a ring magnet the magnetization is done diameterically to the ring geometry..hence if one assume to use the ring magnet same a flat round magnet.it would behave like what you said..NSN or SNS.
Rgds,
Faraday88.

[wrtner]

Here's where I get mine. Best price I've found and very fast shipping. http://www.magnet4less.com/product_i...roducts_id=255

They look very good. Their web site is a nightmare if you live outside the US (or Puerto Rico, Canada or Mexico). I have emailed them and wait in anticipation. Thanks.

[Gary Hammond]

These are the magnets that I used for this project: https://www.harborfreight.com/2-piec...cks-98406.html They only have a 3lb pull force. They are adequate enough to activate the transistor via the trigger coil. I'm not sure if they are C8, but they are only 99 cent right now for a 2-pack. They are easily sourced as long as you have a HF in your area.

I've used circle ceramics before. They worked. I don't think that it matters too much what the shape of the magnet is that you use. The only one that you may have trouble with is a ring magnet when using a trigger coil. The abrupt nsn or sns that you get with a ring magnet is where the trouble comes from.

Here's where I get mine. Best price I've found and very fast shipping. http://www.magnet4less.com/product_i...roducts_id=255

[DMANN]

I am building a basic SG and the recommended magnets, C8, 2" x 1" x 0.5 are expensive. Will I get sufficient results from ceramic, C8, round 1" dia x 0.3" which cost a quarter of the price?

These are the magnets that I used for this project: https://www.harborfreight.com/2-piec...cks-98406.html They only have a 3lb pull force. They are adequate enough to activate the transistor via the trigger coil. I'm not sure if they are C8, but they are only 99 cent right now for a 2-pack. They are easily sourced as long as you have a HF in your area.

I've used circle ceramics before. They worked. I don't think that it matters too much what the shape of the magnet is that you use. The only one that you may have trouble with is a ring magnet when using a trigger coil. The abrupt nsn or sns that you get with a ring magnet is where the trouble comes from.

[wrtner]

I am building a basic SG and the recommended magnets, C8, 2" x 1" x 0.5 are expensive. Will I get sufficient results from ceramic, C8, round 1" dia x 0.3" which cost a quarter of the price?

[RS_]

figured it out... thanks