Many power supply designs I've found are based on single-chip regulators (LM78xx, LM79xx, LM317, etc.), which require few external components and are supposedly very rugged and reliable. But, since I'm interested in learning how linear power supplies actually function, this series of videos has been extremely helpful. Your approach of building up the circuit in steps and testing as you go makes it easy to understand what is happening, and why.
I am wondering why the OpAmp output resistor at 10:23 is put directly at the output of the OpAmp, which in turn will affect not only the collector at the second transistor but the base of the power transistor also? What if the resistor were put on the collector input to the second transistor AFTER the splice instead? Then it would only affect the second transistor. Can you explain this a little deeper please?
Thank you for your great video. So if you want to regulate a potentiometer it should handle the output current? So in a bigger power supply it would be a heavier potmeter?
At some point in this series, you mention adding an OPAMP to do ??? but that would be covered in the OPAMP series. I have looked and can't figure out what to look for. Can you please direct me to the video that adds the last OPAMP to complete the Linear PSU? BTW, your instruction style is the best in general.
the zener can be replaced with a resistor divider using a potentiometer to modify the current at the output? i need to regulate a fixed 5v from 150mA to 1500mA
Not necessarily. A radio tech really only needs a fixed power supply at 13.8 Volts. Granted I have supplies that range from 0-20V @ 400 Amp at the low voltage end for solid state work to ones that do 0 to 3,000 Volts @ 2 Amps at the high voltage end for RF tube type amplifiers. But for someone who is only repairing two way radios 13.8 Volts is all you need. Most commercial and public service two way radio repair shops are like that.
This is very helpful, I'm exploring how to limit the current limiting, and you have shown the way. highly appreciated!
Great teaching. Thank you!
Many power supply designs I've found are based on single-chip regulators (LM78xx, LM79xx, LM317, etc.), which require few external components and are supposedly very rugged and reliable. But, since I'm interested in learning how linear power supplies actually function, this series of videos has been extremely helpful. Your approach of building up the circuit in steps and testing as you go makes it easy to understand what is happening, and why.
Microchips aren't secure
I always find it useful and informative ❤
Great videos Greetings from Mexico.
I am wondering why the OpAmp output resistor at 10:23 is put directly at the output of the OpAmp, which in turn will affect not only the collector at the second transistor but the base of the power transistor also? What if the resistor were put on the collector input to the second transistor AFTER the splice instead? Then it would only affect the second transistor.
Can you explain this a little deeper please?
Thank you for your great video. So if you want to regulate a potentiometer it should handle the output current? So in a bigger power supply it would be a heavier potmeter?
At some point in this series, you mention adding an OPAMP to do ??? but that would be covered in the OPAMP series. I have looked and can't figure out what to look for. Can you please direct me to the video that adds the last OPAMP to complete the Linear PSU? BTW, your instruction style is the best in general.
Simply great !!!
the zener can be replaced with a resistor divider using a potentiometer to modify the current at the output?
i need to regulate a fixed 5v from 150mA to 1500mA
Great video. Thanks
A bench supply needs to be variable.
Not necessarily. A radio tech really only needs a fixed power supply at 13.8 Volts. Granted I have supplies that range from 0-20V @ 400 Amp at the low voltage end for solid state work to ones that do 0 to 3,000 Volts @ 2 Amps at the high voltage end for RF tube type amplifiers. But for someone who is only repairing two way radios 13.8 Volts is all you need. Most commercial and public service two way radio repair shops are like that.
mostly you will need 12 9 5 3,3 if working with electronics
and usually is 5v for ttl or cmos unless you do some DIY audio