Oh No... Not another Slayer Exciter Question

Thread Starter

RandyFL

Joined Aug 28, 2014
147
I was toying with these slayer exciter circuits ( I know what you're going to say - internet circuits " lol " ). Anyway long story short I found one that worked but I can't keep the 2N2222 transistor from melting...

2n2222 slayer exciter - Google Search

9 volt battery
22k resistor for the base
LED
2N2222 transistor
L1 is 2 turns
L2 is 100 turns

everything works the LED lights, the L2 lights a florescent bulb yada yada after 5 mins or so the little 2N2222 starts smoking and then melts. I understand its just a signal transistor and not a power transistor. And its not designed to be a power transistor. My question to whoever comes on board is - what could I do to stop it from melting or getting hot... I don't know enough about electronics to replace it with a TIP3055 or MJE3055T ( which could be connected to a heatsink ). I guess my ultimate goal is to swap to a 3055 but whats the logistics of it.

R
 

Thread Starter

RandyFL

Joined Aug 28, 2014
147
Where in the design would the capacitor go? And what size capacitor?
I will order it and the two transistors from mouser electronics.
R
 

Danko

Joined Nov 22, 2017
1,134
everything works the LED lights, the L2 lights a florescent bulb yada yada after 5 mins or so the little 2N2222 starts smoking and then melts. I understand its just a signal transistor and not a power transistor. And its not designed to be a power transistor. My question to whoever comes on board is - what could I do to stop it from melting or getting hot...
With peak collector current about 4A and with C-E peak voltage about 500V, life of 2N2222 is very short.
Use transistor with Ic_max = 6A...10A and with Vcbo_max = 1000V...1500V.
For example see Slayer Exciter Tesla Coil Problem
1627469105757.png 1627467926010.png 1627468012477.png 1627468136284.png
ADDED:
Circuit above oscillates at 1.8MHz and consumes 1.2A from V1.
Transistor Q1 dissipates 8W.
 

Attachments

Last edited:

Thread Starter

RandyFL

Joined Aug 28, 2014
147
Danko
the only transistor that fits your parameters is a 2SC3552
don't you think its a little overkill at this point ?
But I'm open for suggestions...

Randy
 

Danko

Joined Nov 22, 2017
1,134
Danko
the only transistor that fits your parameters is a 2SC3552
don't you think its a little overkill at this point ?
But I'm open for suggestions...
Not only 2SC3552, also BUV47A.
Not overkill, pulses may be much higher, when you will adjust circuit.
BUV47A: https://www.ebay.co.uk/itm/174148461585
https://www.bonanza.com/listings/6-...-Bipolar-Transistor-New-Original-ST/866296587
ADDED:
Check this link:
https://www.ebay.com/itm/172794738091
-----------------------------------------------------------------------------------
ADDED:
Because of small, very high frequency coil, low frequency transistors (2SC3552, BUV47A, D2499)
will not good work in your device.
EDIT: Try 2SC3552 in circuit below (thanks @sparky 1)
Use $0.35 transistor BUD42D, https://www.rocelec.com/part/ONSBUD42D-1G,
in circuit below:
1627512250350.png 1627512061694.png 1627511923143.png
Frequency = 1.8MHz
Collector current = 944mA
Power dissipated by Q1 = 1.17W
Current consumed from power supply = 577mA
 

Attachments

Last edited:

Thread Starter

RandyFL

Joined Aug 28, 2014
147
Danko,
I will use the 2SC3552 ( since I have one ). How does this change the original circuit.
does the 9 volt battery work ( or something higher )
base resistor?
UF2007 diode?

R
 

sparky 1

Joined Nov 3, 2018
576
The original circuit in May 2010 running at 3/4 power lighting florescent tube efficiently, the author went by name gbluer.
After that there were mini slayers attempting to see how low they could go lighting an led
later I guess there was a medium size coil lighting the spiral compact florescents.
 

Thread Starter

RandyFL

Joined Aug 28, 2014
147
What resistor should I use for the base of a 2SC3552 …

Or should I use a variable resistor ( what amount )

9 volt ? Or should I go to 12?

R
Ps I’m going build it like the other design
 
Last edited:

Danko

Joined Nov 22, 2017
1,134
22k value of resistor is good choice.
Transistor 2SC3552 is relatively slow, but hope you will lucky.
9V or 12V - it is up to you, you can try different voltages.
 

Thread Starter

RandyFL

Joined Aug 28, 2014
147
I got the 2SC3552 to light 2 LED s wired like I used to test 2N2222 s when I first started this project. I using a 22k in the base and the 9 volt is enough to at least power the breadboard. I will try a UF4007 instead of the LED.

R
 

Attachments

Last edited:

Thread Starter

RandyFL

Joined Aug 28, 2014
147
24:55:00 update… tried using the 2SC3552 and it was a no go. Used a TIP31C and it worked as the photographs show ( red Led - not bright tho ) and the direction of the wires has to be correct before the circuit lights too. And the circuit worked I tried putting the 2SC3552 in place of the TIP31C and it was a no go…
 

Attachments

shortbus

Joined Sep 30, 2009
8,803
Any ideas to get it going?
Just a guess, but why not try to do a better more close together job of wiring? High frequency stuff like this needs to be more concise, not with long wires going everywhere like the picture in post #17. Don't take this as being judgemental of you, just trying to help you to get the project working. The best practice in doing this stuff is to eliminate any long lengths of connecting wires, believe it or not they do have consequences to the circuit working.
 

Thread Starter

RandyFL

Joined Aug 28, 2014
147
Not a problem. :) I did the wiring job this morning at 4am. Since the circuit didn't work let me back pedal and put the tip31C in the place of mje3055T to make sure the circuit is correct. Then we can adjust each segment of the circuit to achieve " working ".
 
Top