Hello everyone.
I have a strange phenomenon about my bridge rectifier circuit.
Transformer primary winding : 220VAC.
Transformer secondary windings : 9.4VAC(max 1.5A) , 24VAC(max 700ma), 500VAC(max 100ma).
24VAC and 500VAC are not connected.
The center taps are floating.
There is a cable which is called the shield, the transformer winder told me to connect that to the chasis which i did. He said it is a copper plate between the primary and secondary.
I use the chasis of an old amp which has a switch. The three wire power cable terminals L1 and L2 are connceted to transformer primary through a power switch. Neutral (also probably earth ground and mains transformer center tap) is connected to chasis for safety purposes.
9.4VAC outs, connected to the bridge rectifier inputs.(The anode cathode junctions of the diodes.)
The diodes i am using are 1n5408 (3A Rectified Output Current).
I test them with the scopes component test function and they show a nice L shape. I test them again and again after the operation they don't look that they blew.
I have a couple of questions.
1:
With load, no load, or with a reservoir cap. The circuit draws too much current cables get hot transformer vibrates and if i put an amp meter in series between secondary out and bridge rectifier in it read 2.0 Amps when measuring AC current. The circuit rectifies by the way and ripple calculations are accurate with a 10mF cap and a 33Ohm(15 W heat dissipation capable power resistor network) as the load.
The problem is it draws excessive current from the transformer. I can't and don't want to keep it open more than 4 secs. Why could this be??
An important info is, this does not happen when i install new diodes to circuit, but when i turn the power on and off again the problem starts again.
Inrush current?? but my diodes seem ok. I can't figure the problem out.
2:
There is an AC voltage across chasis to chasis around 6.5 V. Why would that be?
Thank you very much.
I have a strange phenomenon about my bridge rectifier circuit.
Transformer primary winding : 220VAC.
Transformer secondary windings : 9.4VAC(max 1.5A) , 24VAC(max 700ma), 500VAC(max 100ma).
24VAC and 500VAC are not connected.
The center taps are floating.
There is a cable which is called the shield, the transformer winder told me to connect that to the chasis which i did. He said it is a copper plate between the primary and secondary.
I use the chasis of an old amp which has a switch. The three wire power cable terminals L1 and L2 are connceted to transformer primary through a power switch. Neutral (also probably earth ground and mains transformer center tap) is connected to chasis for safety purposes.
9.4VAC outs, connected to the bridge rectifier inputs.(The anode cathode junctions of the diodes.)
The diodes i am using are 1n5408 (3A Rectified Output Current).
I test them with the scopes component test function and they show a nice L shape. I test them again and again after the operation they don't look that they blew.
I have a couple of questions.
1:
With load, no load, or with a reservoir cap. The circuit draws too much current cables get hot transformer vibrates and if i put an amp meter in series between secondary out and bridge rectifier in it read 2.0 Amps when measuring AC current. The circuit rectifies by the way and ripple calculations are accurate with a 10mF cap and a 33Ohm(15 W heat dissipation capable power resistor network) as the load.
The problem is it draws excessive current from the transformer. I can't and don't want to keep it open more than 4 secs. Why could this be??
An important info is, this does not happen when i install new diodes to circuit, but when i turn the power on and off again the problem starts again.
Inrush current?? but my diodes seem ok. I can't figure the problem out.
2:
There is an AC voltage across chasis to chasis around 6.5 V. Why would that be?
Thank you very much.