How to test a 7805 regulator in a ZX Spectrum with a cheap multimeter – MFS Quicktip!
A new format for me in this *very* short video on how to test a 7805 regulator in a ZX Spectrum 48k. Although the regulator is different in many other types of machines it’s the same process to check!
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Mark Fixes Stuff
Just a geek, geeking about. Not a nerd.
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Hey Mark. Firstly. Thanks for your videos. They really are a good watch and have learned from you. Secondly. I have bought a multimeter to test some sinclairs. I have a dead +2. How would i go by testing the mains? Is it the same process as on your 48k video?
Hi Jamie. I would recommend not going near the mains supply. If everything else in the house is working the mains will be OK. If it’s a plus two with a barrel plug connector, you can test the tip of the barrel plug for 9v (centre negative) and if it’s a black one with the DIN type connector, look at my +2 power supply video so you can check the fuses. There are also some 78xx series regulators inside the +2/+3 models which you can test with the same process as shown in this video.