power supply for laptop in radio applications

Conventional power supply with a normal mains transformer, constructed to feed a laptop that is used in radio applications. Normal computer power supplys are mostly switching power supplies, operating on approx. 50 Khz or so. They can create huge radio noise and disturbances when you use them near a (Shortwave) radio, because the squarewave creates spikes and harmonics over a broad frequency band. Construction: mains transformer, bridge rectifier, 2 trans Darlington with a zenerdiode from basis to earth, over the zenerdiode a capacitor from approx 220 uf + a capacitor of 100N. In the video I tell about the zener, perhaps this is not clear. what I mean is this: I took the voltage to feed the stabilizing circuit only 2 Volts higher as the zener voltage and used a resistor. This for the case that the zener eventually burns out. In that case the computer is not damaged by the higher voltage that can occur in that case. The car lamp is my short circuit protection. If you watch this video on another channel as You Tube, please check youtube for the original content and possible changes in the text.

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