I have one of the old Pyramid PS-7 Power Supplies I have been trying to get to output the 13.8 Volts. I have the Original Schematic and a Redrawn Schematic one I get 10.2 Volts the other I get 11.3 Volts. There is no wattage value on the small resistors which were probably 1/4 watt and now they are 1 watt and the load resistor was 5 watts and I only had a 7 watt. Does the higher wattage resistor change the Voltage output - or is there something else keeping the Voltage Low?
>> Could this be a good Tip..: ,,Run Zener's (in all cases of sizes /zenerVoltages) to around 20mW - 60mW. ,,Say fex.. '30-mW' (milli-Watts). _One could in addition put in a current-source driving (for this case, trough this 6v2-zener) 5 milli-Amps trough the Zener. ,,-->No need to run Zeners towards their socalled 'max-specs'. //Thanks for interesting videos and good content.
In addition to running the Zener at a sensible current choose a 5v1 Zener as these usually have a near zero temperature coefficient. Lower voltage Zeners have an increasingly negative temperature coefficient and higher voltage Zeners have an increasingly positive temperature coefficient.
Also add a 10uF decoupling capacitor across the zener. Could add a series diode as well as a crude temperature compensation measure. It will increase the voltage slightly if the potentiometer is reconnected across the zener and diode together with the decoupling capacitor.
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Very clear and helpful, thank you.
I need a good power supply. wanted to make myself to save money. I dont have to do the experiments now. Thanks a lot.
I always find it useful and informative ❤
Very interesting video, thank you.
Great video. Thanks
I'm learning alot.
I have one of the old Pyramid PS-7 Power Supplies I have been trying to get to output the 13.8 Volts. I have the Original Schematic and a Redrawn Schematic one I get 10.2 Volts the other I get 11.3 Volts. There is no wattage value on the small resistors which were probably 1/4 watt and now they are 1 watt and the load resistor was 5 watts and I only had a 7 watt. Does the higher wattage resistor change the Voltage output - or is there something else keeping the Voltage Low?
Thank you soo much sir for this lesson
Nice. Are you going to cover current regulation?
From 24:20 it's like an eye operation!
You are save my job🎉
>> Could this be a good Tip..: ,,Run Zener's (in all cases of sizes /zenerVoltages) to around 20mW - 60mW. ,,Say fex.. '30-mW' (milli-Watts).
_One could in addition put in a current-source driving (for this case, trough this 6v2-zener) 5 milli-Amps trough the Zener. ,,-->No need to run Zeners towards their socalled 'max-specs'. //Thanks for interesting videos and good content.
In addition to running the Zener at a sensible current choose a 5v1 Zener as these usually have a near zero temperature coefficient. Lower voltage Zeners have an increasingly negative temperature coefficient and higher voltage Zeners have an increasingly positive temperature coefficient.
👍👍👍👍
Also add a 10uF decoupling capacitor across the zener. Could add a series diode as well as a crude temperature compensation measure. It will increase the voltage slightly if the potentiometer is reconnected across the zener and diode together with the decoupling capacitor.
👏👏👏👍👍👍