12Vdc input. I thought it was over gate resistance, but it didn't work, so I changed to bjt, didn't work. bought new transformer, didn't work. changed DC input, STILL DIDNT WORK AAAH!View attachment 203991View attachment 203994thi
I am using this setting in ic 555 to build this circuit.
Please Where did I go wrong? I am using 220v-12v transformer and IRFZ44N. The circuit is oscillating but no output
What's your supply, a pp3 battery or something bigger. What transformer are you using (link to data sheet?)12Vdc input. I thought it was over gate resistance, but it didn't work, so I changed to bjt, didn't work. bought new transformer, didn't work. changed DC input, STILL DIDNT WORK AAAH!
diagram sir?What do you expect?
You are putting pulsed DC into a transformer, which means it is operating as a flyback transformer that will output short, high-voltage pulses.
Is that what you want?
If you want a square-wave output then use a push-pull driver at the 555 output and connect a large capacitor in series between the push-pull output and the transformer input to block the average DC which will otherwise saturate the core.
I'm using a 12v transformer, 12v 7AHbatteryWhat's your supply, a pp3 battery or something bigger. What transformer are you using (link to data sheet?)
FETs could be used but it is simpler to use an NPN and PNP in an emitter follower push-pull configuration.A Push pull means I'm gonna use a bjt right? no FET?
Not really. Though the oscillation frequency is a little low.What do you expect?
You are putting pulsed DC into a transformer, which means it is operating as a flyback transformer that will output short, high-voltage pulses.
Is that what you want?
FETs could be used but it is simpler to use an NPN and PNP in an emitter follower push-pull configuration.
What are you powering, and how much current will it draw from the transformer output?
The transistors will have to supply 220/12 ≈ 26 times that current.
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FETs could be used but it is simpler to use an NPN and PNP in an emitter follower push-pull configuration.
What are you powering, and how much current will it draw from the transformer output?
The transistors will have to supply 220/12 ≈ 26 times that current.Just a Maybe between 30-80 watts to do some small thingsFETs could be used but it is simpler to use an NPN and PNP in an emitter follower push-pull configuration.
What are you powering, and how much current will it draw from the transformer output?
The transistors will have to supply 220/12 ≈ 26 times that current.
If fet's work, I'm gonna use em.Thank you all for your replies, but something strange happened. I changed the transistor to a D882 Bjt, and the everything works! But my question is,I don't know if if was the FET that had the fault, but it just worked immediately with the D882. I changed to a MJE13005,but it didn't still WORK. as it stands now, I am confused why the Bjt powered it. I reduced rbase to 56ohms and it kicked a few times with the others but didn't work. And also, Can I add more Bjts in parallel?
This old circuit has so many voltage losses that its loaded output voltage is very low, unless the transformer has a low input voltage rating. Then the transistors will overheat unless the output current is low.
I have no center tap transformer but I have parts, that's why.This old circuit has so many voltage losses that its loaded output voltage is very low, unless the transformer has a low input voltage rating. Then the transistors will overheat unless the output current is low.
This circuit is working, but Is there any way I can use A FET instead of those BJT's?