Building a Linear Power Supply, Part 6 Design Troubleshooting

Why does the power supply, while starting with a four-amp transformer, only deliver a few hundred milliamps?

[@HunzolEv]

This is just a master class!

[@carlgradolph9676]

Thanks for this deep dive into power supply design. Your explanations are the clearest I've yet seen. Now I understand why, in a different video series on linear power supply design, multiple pass transistors were employed in parallel --since each one of the transistors in such a configuration dissipates a portion of the total heat.

[@robertmckelvey3091]

I really need the next power supply video

[@keithfisk5641]

A couple of observations: 1. When designing do not make generic assumptions about component characteristics such as rectifier diode forward voltage drop - read the data sheets. For example, the Vishay data sheet for 1N4000 series diodes lists Vr = 1.1 volts at 1.0 amp so Vr = 0.7 amps is not a valid design assumption. 2. Your voltage analysis seems to have completely neglected the ripple voltage on the filter capacitor. Even if the transformer and the diodes each had 0 ohms resistance, as the load current increases the effective voltage across the filter capacitor will drop. To determine the required transformer secondary voltage you need to consider several things: the operating range of your incoming mains voltage (often between +/- 6% to 10% depending on location), the transformer regulation characteristics, rectifier forward voltage drop, filter capacitor ripple voltage and then the requirements of the chosen regulator topology.

[@stoneysauce]

This is an intriguing and suspenseful serial, in the genre of 'who done it'. I want to see what happens next.

[@ColossusEternum]

I had a huge eureka moment when I realized that RMS voltage = Peak voltage * sin(45°) I haven't really heard an electronics teacher point that out but I think it's a really intuitive way to think about it.

[@paulperano9236]

Switching supplies are very useful until you start playing with sensitive pre-amplifiers. The switching supplies are very 'noisy' and this 'noise' gets amplified along the input signal. Linear supplies are much cleaner. Suggestion - have BOTH if you can afford it. 😀

[@ChrisHalden007]

Very interesting. Thanks

[@garypoplin4599]

16:03 - Is _Wonky_ a technical term?

[@igormendonca4026]

ISTJ

[@YousefAboAnNour]

The best electronics channel in youtube for real, thank you very much please consider converting to Islam