Use for the Tesla Switch

[Matthew Jones]

The transformer I used had 2 windings that were equal and one for output that was 20% longer. As far as wire size goes use something that will give you 100 turns or better

I'll dig one out tomorrow and measure
the resistance and Henry count.

Matt

[Kepszlok]

The transformer I used had 2 windings that were equal and one for output that was 20% longer. As far as wire size goes use something that will give you 100 turns or better

I'll dig one out tomorrow and measure
the resistance and Henry count.

Matt

Thaks!

I do some calculations. (1km of 20AWG wire's resistance are 33.2ohm, according to SaturnPCB program) So 200 feet (61m) from 20AWG will gives ~2 ohm. From this, i think the DC resistance of your windings will be around 0.5 - 0.6 ohm. This low DC resistance on both windings are the key for this transformer to work well?

I see now you are used only the metal core and the plastics from that CT transformer, and you replaced all of the windings. It's ratio (secunder to primer) are around 1:1.2 because of the longer primer winding?

[Matthew Jones]

Thaks!

I do some calculations. (1km of 20AWG wire's resistance are 33.2ohm, according to SaturnPCB program) So 200 feet (61m) from 20AWG will gives ~2 ohm. From this, i think the DC resistance of your windings will be around 0.5 - 0.6 ohm. This low DC resistance on both windings are the key for this transformer to work well?

I see now you are used only the metal core and the plastics from that CT transformer, and you replaced all of the windings. It's ratio (secunder to primer) are around 1:1.2 because of the longer primer winding?

Dead ON!! .52 ohms. .55 on the output. I also found later that winding the output wire closest to the core and then winding the primaries on the outside gave a better efficiency. So keep that in mind.

Cheers
Matt

[Kepszlok]

Dead ON!! .52 ohms. .55 on the output. I also found later that winding the output wire closest to the core and then winding the primaries on the outside gave a better efficiency. So keep that in mind.

Cheers
Matt

Hehe, trust me, i'm an engineer!

Now i can build this transformer by myself, thanks for the details. I'm going to get a proper core and mag. wire.

[AdAn]

how to determine the resonant mode?
in the article mentioned, in the report

PS: Sorry for my english

[Donald Haas]

Hi Matt,
Pluggin' along.
Wanted to ask if you had tried something.
In the Brandt schematic(attached) he's switching 36v into 12v.
Have you tried this?: (attached)
Might get a little "sparky"
Thanks,
Donald

[holtage]

Anyone can help me? (Preferably John Bedini)

I am trying to use one 555 timer, some bipolar junction transistor, some diode to switch current (change direction) at 300hz to power a load, but I failed. Should I use two 555 timer instead of one?

[Matthew Jones]

Post on Johns site, or use a multi vibrator.
Heres a calculator to get the frequency where you want it. Might have to add some variable resistors.
https://electrosome.com/astable-mult...r-transistors/

You can also use a an NPN and PNP to trigger either side from your 555. When the 555 is off it will drive the PNP when ON it will drive the NPN. Little bit more to it but it works as well

Matt

[holtage]

Which pin of 555 timer connect to pnp?

Mathew Jones:

To my understanding, when 555 timer is off, no current will flow from ouput pin of 555, so that will drive pnp ? But which part of pnp to connect to output pin of 555? Also, the working principle of pnp is so confusious. Please explain more in detail. That is so frustrating to do some things which seems easy but difficult and complex in practice.

[Matthew Jones]

Mathew Jones:

To my understanding, when 555 timer is off, no current will flow from ouput pin of 555, so that will drive pnp ? But which part of pnp to connect to output pin of 555? Also, the working principle of pnp is so confusious. Please explain more in detail. That is so frustrating to do some things which seems easy but difficult and complex in practice.

No the 555 will pull down, when OFF. That means its connected to ground or to the negative polarity. Ground turns on the PNP. Any operation of the 555 is basic 101. Just hook the BASE of an NPN and a PNP to the output of the 555 and watch which one comes on based on the state of the 555.
This is 101 electrical engineering. You have to do it and learn for yourself. You'll see.

[holtage]

Fast switching of current

I use a a 9v battery, 7.5v battery, 2 npn transistor, 1 light bulb, some connecting wire, some diode, a 555 timer. I use the 555 timer which is powered by the 9v battery to switch on and off of the two transistor so that one of them will be on while another of them will be off all the time and vice versa. The 7.5 v battery is used to power the light bulb in which the path is governed by two transistor. You know what I am going to do: fast switching of currents at a frequency of at at least 200hz making electron fail to move but allow current to flow through the light bulb. But at present I failed to do so. I can only use 555 timer to produce pulsed square wave of current but not continuous steady current by the to transistor. The circuit path will be very complex. Anyone with suggestion?

[genessc]

You ever rig up the SG front end to use the Tesla switch? NPN transistors will switch so long as you have the "relative potentials" setup properly... Pretty nifty, been about 5 years since I did that tho...

Cheers!
Gene

I use a a 9v battery, 7.5v battery, 2 npn transistor, 1 light bulb, some connecting wire, some diode, a 555 timer. I use the 555 timer which is powered by the 9v battery to switch on and off of the two transistor so that one of them will be on while another of them will be off all the time and vice versa. The 7.5 v battery is used to power the light bulb in which the path is governed by two transistor. You know what I am going to do: fast switching of currents at a frequency of at at least 200hz making electron fail to move but allow current to flow through the light bulb. But at present I failed to do so. I can only use 555 timer to produce pulsed square wave of current but not continuous steady current by the to transistor. The circuit path will be very complex. Anyone with suggestion?

[genessc]

Here is the "ole faithful" 555 timer site I used to use when I was playing with sequentially coupling the 555's between each of them.

555 Timer Calculator

Nice cuz it shows also how to get below that 50% duty mark... Second schemo further down the page.

Cheers,
Gene

No the 555 will pull down, when OFF. That means its connected to ground or to the negative polarity. Ground turns on the PNP. Any operation of the 555 is basic 101. Just hook the BASE of an NPN and a PNP to the output of the 555 and watch which one comes on based on the state of the 555.
This is 101 electrical engineering. You have to do it and learn for yourself. You'll see.

[genessc]

I once setup a 6 x 12vdc 7ah battery setup that sorta emulated the brandt config, tho it was using my own circuitry to control the on/off times of the two halves of the circuit. As long as theres something in series, and no connections being made or broken when the switches are thrown, no sparks come out... tho if you have very low resistance everywhere in the circuit you might overcurrent and blow it out. Really depends how much Amps are allowed to flow as to if anything will get destroyed when the switch gets flipped.

Made some weird waveforms from that setup... still have it collecting dust in the garage here somewhere.

Cheers.
Gene

Hi Matt,
Pluggin' along.
Wanted to ask if you had tried something.
In the Brandt schematic(attached) he's switching 36v into 12v.
Have you tried this?: (attached)
Might get a little "sparky"
Thanks,
Donald

[holtage]

I cannot invert 555 signal using pnp transistor

It seems that the pnp transistor work in the following way: when current pass from emitter to base, the emitter to collector will let current to pass. I cannot invert 555 signal by connecting output pin (pin 3) of 555 to the base terminal of pnp transistor. It won't work. Anyone can help me?