Inverter Circuit 12V DC to 230VAC Sine Wave
- Thread starter harrychoo
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audioguru2
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Hi Steven,
I couldn't find a datasheet for those transistors to see their ratings. They appear to be made in the 21st week of 1993.
Jaycar don't say the inverter is 140W. They rate it at only 30W.
View attachment 40080
I couldn't find a datasheet for those transistors to see their ratings. They appear to be made in the 21st week of 1993.
Jaycar don't say the inverter is 140W. They rate it at only 30W.
View attachment 40080
heres the transformer i got allready for it just have to drill the heatsinks and wire it up and test itView attachment 40095
heres the latest results of the super simple inverter circuit, notice the size of the holes in the circuit board for the wires , they can only take certain size wires ,of certain gauge.
so the holes would need to be enlarged for a bigger gauge wire which i did latter. the 10 ohms wire wound resistor ,at 10 watts would need to be increased to a higher wattage. as it got hot dureing testing, just one only i felt to be hot.
the whole transistor and heatsink on the right got hot but held up well and so the recamended heatsinks could be increased in size more to.
at first test useing only normal wire, before i changed it to thicker wire after redrilling the holes for a larger size , i got a voltage of 139.7 volts so i turned the tripot fully to the right and it went up to 143.3 volts ac . and thats from useing only a 12 volts sealed lead acid cell battery and not a car battery .
the transformer made the low whining sound or huming sound .
in the picture is a microwave oven screw type globe i powerd that with the output no problems it wasent fully bright , but bright enougth, it was daytime so ill try it at night . since ive chaged the wires to a thicker gauge ill do another test soon , to see if its improved
the power transformer i got has 2x 12 volts and 2x 15 volts ac outputs and 2x zeros i bridged the zeros and used them both and i used the 12 volts outputs
View attachment 40141
the latest test with the thicker wire all installed after the last picture was taken gave me the total voltage output of 156 volts ac which dropped to 152 as the one transistor and the whole heatsink got hot so i adjusted it down to 150 volts ac. which would be ok as it dident heat the transistor up and the heatsink its on , i waited it to cool down and fired it up again and at 150 volts ac it was only warm so unlless i can get the tempiture details for thoses trasistors so i can know how hot they get before they fail if they do, ill leave it at 150 volts ac which is more than enougth for the water gas circuit and the cold fusion reactor , there seems to be only one supplier in this country for the bd234 which i need more of to make a better inverter and they are over in queens land australia , the water gas circuit uses only 120 volts ac to separate hydrogen from water . this circuit if i ran it off a car battery which has more current it may of cooked the transistors i think, so my smaller battery is fine for it and the 150 volts would be more handyer for countrys that use that voltage , so now i have a 12 to 150 volts invertor for expserimenting with and when i can get a decent size houseing for it ill slowly adjust the trimpot and bring the voltage back up steady till its not to hot and settle at that , those microwave oven tempiture switchs sure may be handy to switch the circuit off when it gets to hot , you can get them for different tempitures to , i may latter try a bigger heatsink or use the 2n3055 transistor
audioguru2
- Apr 6, 2004
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Hi Steven,
It Sort-of works! ;D
How many Watts is the light bulb rated for? You said it wasn't fully bright so it was glowing at less than its rated power.
Your voltmeter is calibrated to read sine-waves unless it is "True RMS", so it probably shows a higher voltage that is actually there because the inverter produces a square-wave.
It Sort-of works! ;D
How many Watts is the light bulb rated for? You said it wasn't fully bright so it was glowing at less than its rated power.
Your voltmeter is calibrated to read sine-waves unless it is "True RMS", so it probably shows a higher voltage that is actually there because the inverter produces a square-wave.
theres no details on the microwave oven light globe but i have another one around so ill se if it has any details on it but when i l;it it up it was pritty bright but in the daytime you cant be sure but i reckon it would be brighter at night ill remeasure its voltage with my other meter when i get to itthe bd234 transistor is very hard to get here where i am as all the electronics suppliers ive checked dont have it , so the only way to get more is to pay $19 for another kit from jaycar electronics, i want to increase the size of the main board and make a few improvements , id like it if someone can look at the circuit again and make some changes to it so that it can use more comon easyer to get transistors rarther than the bd234, the bd234 from what i can find dosent have any comon replacements here otherwise i could get them ,2amps 45 volts 25 watts thats all i can find out about the bd234 , so if anyone can make the chnages to the circuit so it can use a better easyer to get part id be happy
audioguru2
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Hi steven,
Hundreds of transistors will replace the BD234 in that circuit. The TIP32 for example costs $.60US.
Why replace the BD234 driver/oscillator transistors? It is the 2N3055 transistors at the outputs that do all the work and if they are paralleled then the output power might be a little more.
This circuit depends on high gain output transistors but you can't buy high gain ones.
2N3055 transistors have a wide range of gain so if you buy some you might be lucky and they will have high gain, or you might be unlucky and they will have low gain.
You said that one output transistor gets hot. It must be a low gain one.
Hundreds of transistors will replace the BD234 in that circuit. The TIP32 for example costs $.60US.
Why replace the BD234 driver/oscillator transistors? It is the 2N3055 transistors at the outputs that do all the work and if they are paralleled then the output power might be a little more.
This circuit depends on high gain output transistors but you can't buy high gain ones.
2N3055 transistors have a wide range of gain so if you buy some you might be lucky and they will have high gain, or you might be unlucky and they will have low gain.
You said that one output transistor gets hot. It must be a low gain one.
heres the latest pictures , with the inverter circuit all secured to a board for the time being well ill use it as my high voltage ac playstation for expserimentsView attachment 40158
audioguru2
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Hi Steven,
Why do you want to replace the BD234 transistors in your inverter circuit?
Why do you want to replace the BD234 transistors in your inverter circuit?
i dont want to replace them i just want to exspand the size of the circuit and biuld a more spacey one so i just want these bd234 trannys but if the tip142 is ok ill try it ,even though they are bigger,tonight i rplaced the tesla trannys for 2n3058 trannys which i was told are more poerfull than the 2n3o55, but the voltage went down and the same left tranny got hot so i put the tesla ones back and turned the voltage output down to 100.7 volts ac if i turn it up more the voltage drops and the tranny gets hot so ive got it set to that , ill charge up my 12 volts battery more as its around 11 volts .View attachment 40163
thats a 2 amp 250 volts microwave oven globe there , its written on the brown plastic globe holderView attachment 40164
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