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You are right, if I modify C7 series resistance, then the current from BC327 base modifies as well.
I am not sure if LM317 was going into thermal limit...
Hello ! I am working at a LM317 power supply (tracking preregulator) and I found on the internet a schematic for overload indicator, which I added into my simulation and into my test circuit. After simulating, I found that the Base current of Q9 has spikes of about 4.5-5A, which I think that is...
Hello @00kam ,
This circuit is a linear power supply. It uses a preregulator for LM317, which has the role to keep the LM317 input at about 4-5V above LM317 output. The preregulator is made using 2 2N3055. I used 2 x 2N3055 because the short circuit current through the LM317 is abot 2.7A (max)...
The maximum load current from the 30Vac secondary will be 3A and from the 17Vac secondary will be about 0.8A.
I will use the power supply to power resistive loads and inductive loads (motors).
On the 17Vac secondary, will be connected 3 x 12V 80mm fans.
Hello, I had a toroidal transformer with 200VA power and 2x17Vac secondary. I needed a 30Vac secondary so I started to take off a few turns until the voltage of the 2 serial secondaries was at about 30Vac. After making this modification, I needed a 24Vac output, so I started again to reduce the...
I am working at a project which involves the TL431 shunt regulator. The schematic of the regulator is in the attachment.
I want to see on the oscilloscope if the power supply is oscillating.
Are there any standard procedures when viewing the output of the regulator on the oscilloscope ? I...
And I found that if I connect the probe to ground right after the moment when I turn the oscilloscope on, then the offset is present on the screen, but if I wait a few minutes after turning it on and then I connect again the probe to ground then the offset is gone.
I have checked again, with no probe or other thing connected to the input.
It is normal that the trace to appear lower than the CH1 marking on the screen ?
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