Ok, i tried as you stated Perry. The 1 ohm 10 watt resistor did not get hot, the transformer barely got warm after 1 minute.
Could i check the voltage on the secondary windings? If so, (with black led on the center if the secondary windings and red on the outer windings I'm only getting 2 mv to 14 mv from the secondary windings. I'm i getting these readings because i don't have rectifiers on the secondary windings?
Could i check the voltage on the secondary windings? If so, (with black led on the center if the secondary windings and red on the outer windings I'm only getting 2 mv to 14 mv from the secondary windings. I'm i getting these readings because i don't have rectifiers on the secondary windings?
Yes i have continuity between all three primary windings and same for the secondary windings.
I wish i knew how to do add the extra windings on one of the main transformers. I know i have to use magnet enamel copper wire (16g to 20g)? But then would i add rectifiers/fusible resistors? Or just send the windings straight to where the secondary windings where on the board?
I wish i knew how to do add the extra windings on one of the main transformers. I know i have to use magnet enamel copper wire (16g to 20g)? But then would i add rectifiers/fusible resistors? Or just send the windings straight to where the secondary windings where on the board?
You don't need anything larger than 20g. Start with 5+5 windings. You will connect the center-tap from those 10 windings to the center tap of the secondary for the small transformer. The two other windings will go into the two points where the ±15v output from the small transformer were connected.
When you state that you had continuity, did you essentially read 0 ohms for all windings?
When you state that you had continuity, did you essentially read 0 ohms for all windings?
When you state that you had continuity, did you
essentially read 0 ohms for all windings?
Yes, my meter read 0.2ohms due to the leads having a .2 ohm resistance.
Is there any good sites where i can learn more on how to wind a transformer, I've never done it but don't get me wrong i want to learn. I have a basic understanding on how they work. I'll look at a smaller amp's transformer (one with few windings) so i can clearly understand how they are turned (clockwise, counter clockwise, ect. <---this is where am lost.)
essentially read 0 ohms for all windings?
Yes, my meter read 0.2ohms due to the leads having a .2 ohm resistance.
Is there any good sites where i can learn more on how to wind a transformer, I've never done it but don't get me wrong i want to learn. I have a basic understanding on how they work. I'll look at a smaller amp's transformer (one with few windings) so i can clearly understand how they are turned (clockwise, counter clockwise, ect. <---this is where am lost.)
The way the windings are wrapped are not very important for this low-current application. Wind 5 turns. Wind another 5 turns in the same direction. The two wires that are closest to each other from the two individual windings will be the center-tap.
You may want to insert a current limiting resistor in the center-tap in case something in the circuit that it's driving is shorted.
You may want to insert a current limiting resistor in the center-tap in case something in the circuit that it's driving is shorted.
I'll order some 20g magnet wire, I'll give it a try.... Once i try it...i should be able to measure the ac voltage....right?
What type of waveform should it have?
I have to have -15/+15 and -35/+ 35, so am assuming I'll need 4 wires that will be turned one pair with more turns (the higher voltage). I hope i got it right.
Does this look right? forgot on the diagram the current limit resistor but it will be added.
The green dots are the via holes for the secondary windings for the small transformer.
What type of waveform should it have?
I have to have -15/+15 and -35/+ 35, so am assuming I'll need 4 wires that will be turned one pair with more turns (the higher voltage). I hope i got it right.
Does this look right? forgot on the diagram the current limit resistor but it will be added.
The green dots are the via holes for the secondary windings for the small transformer.
Last edited:
Just wind the 5+5 for now. I don't know if the voltage is going to be right so you may have to re-wind them. I'm assuming that you are only showing one winding from each the high and low voltage windings.
It should be a square wave that swings to approximately ±15v.
I don't know if your meter will read the AC voltage on it.
It should be a square wave that swings to approximately ±15v.
I don't know if your meter will read the AC voltage on it.
. I'm assuming that you are only showing
one winding from each the high and low voltage
windings.
Correct, i didn't want to do all four because I'll overlap the turns on the sketch and might confuse you.
I don't know if your meter will read the AC voltage
on i
How come, its a fluke 111 rms. It reads the voltage on all the transformers I've checked.
one winding from each the high and low voltage
windings.
Correct, i didn't want to do all four because I'll overlap the turns on the sketch and might confuse you.
I don't know if your meter will read the AC voltage
on i
How come, its a fluke 111 rms. It reads the voltage on all the transformers I've checked.
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.