You do such a great job explaining what you do and how you do it, I just discovered you a few months ago, so awesome, do you have anything out that is current? Again thank you !!! Larry Owens Bishop Ca.
Hey Paul! I know this is an old video and I hope you see this. I wanted to let you know that I was able to repair my MS4448PAE Magnum inverter with the same fault. One NTC thermmistor failed causing a 305c FET temp reading. I followed your video and was able to save my inverter. I do have a question, which epoxy did you use on the thermistor?
Wow, has it been 9 years already? I remember when this video came out and eventually developed into an amazing final project with LED amplitude readout. Since supporting Mr Carlson's Lab on Patreon for all these years, I built this tester years ago and it's tested all of my capacitors for RF and Audio circuits and it's more than proven its weight in gold!! No more hum in my speakers!
Thank you for relating your story. You are truly fortunate and amazing. I am thankful you are still with us, and working to help us better understand the world of electronics and radios safely.
Mr Carlon quite rightly so, You and your family live in a stunning house and gardens (yard you guys call it- that aint no yard) ...Sir your a clever man, and do amazing things that even non engineers are drawn to , esp the 'old radio restos' ....keep it up , its well appreciated
For people asking about Mr Carlson putting up this ariel using the cable, method he did ... I refer you to the '80's film '*The Thing*' When 'MacReady' is about to take up the chopper in an oncoming snow storm, 'Bennings' or 'Norris' says "McReady is mad taking her up in this..." 'Palmer' replies "*He knows wat he's doin...*" As does Mr Carlson...😉
Paul could you explain how a single phase VFD that produces a 3 phase output works. Like those found in powering a CNC spindle from single phase. You dont see many schematics out on the web that shows details of such a unit. There are schematics for 3 phase to 3 phase VFD. But as for the Single phase 120 or 240 volt units obscure the parts that produce the 3 phasing. I understand how a 3 phase inverter works using a pony motor. where the pony motor has to be same size or bigger than the motor you are driving in terms of horse power.
This reminded me of an amusing episode of Metalocalypse where the sound engineer was going nuts trying to isolate a buzz on Skwisgar's guitar, and resorted to trying to record him from a steel submersible capsule on the bottom of the ocean.
I used to repair electronics in teeminals used at newspapers in the 80s. I always wondered about this issue and asked myself if I was really installing the caps correctly. Took 40+ yrs to get an answer. Why these aren’t correctly labeled at manufacture is kind of mind boggling. Wouldn’t take too much effort to get that done correctly
Watching this video takes me back to 1970 and my first real job at Control Data testing linear power supplies. The crowbar circuit was used on the +5v ps which had several 2N3055 pass transistors on large heat sinks. Once an assembly girl got a ceramic electrolytic in backwards and we had a nice bang and shower of debris! I moved on to testing logic cards using a GR logic tester powered by a PDP 8 but that is a story for another day.
Many thanks for this video. It took me a little while to work out why you used the brown, yellow etc for the pin numbers. Resistor colour code . Duh. 😂
Hi Paul, I have this idea on building an AM oscillator detector that makes a zero beat tone when it gets a signal from the local oscillator. It will be calibrated to detect from 985 khz to 2155 khz. I don't have a frequency counter and that would make it easy but I like building test equipment and so far it isn't working. The idea is to build an oscillator from old AM transistor radio parts using the red coil and the output from the oscillator goes to one terminal of the primary of an audio output transformer. The other terminal goes to an oscillator of the radio being worked on and the output of the transformer goes to a speaker and when the two oscilators get close in frequency to each other then the speaker will start to make a zero beat tone but so far it isn't working. I think I need to build a differential amplifier instead of using a transformer. I like building radios from spare parts and the most challenging is getting the converter transistor to oscillate at the correct frequency. I built a modular FM radio and each circuit is built on a separate board and plugs in. The tuner/ comverter section is on one board and plugs into the first IF board then second IF, then ratio detect and finally the audio board with speaker and it works. All of the IF transformers and everything are made by the factory but what if for example I want to test a homemade IF transformer. I can do that by plugging the section that I made to see if it will work and that's why I built it like this. Now if I can get my modular AM radio to work. It works but it breaks into oscillation at a certain point on the tuning capacitor. I can't believe AM is giving me such trouble my FM modular radio worked the first time oh well 😁. The most challenging and difficult one to build was a long time ago when I worked at AT&T I had access to some really fine test equipment and I built a dual conversion weather band radio and it took quite a lot of experimenting. It was built all on one board. The front end had to use small signal FETs I couldn't get bipolars to oscillate at that high of frequency
Sounds like a classic 👌 case of counterfeit capacitors. I'd go with a reputable company for your capacitors. I'd also change those yellow bumblebee capacitors. Your friend, Jeff.
Remarkable in-depth video ! Learned and refreshed my electronics knowledge. Can you tell me the exact Sunon replacement model fan you used or would you go with a SilenX ?
Great video as always. When you say it takes x2 re the project and x4 when you add a camera. What would be interesting is to do a 25 minute video but show it from conception in your mind to the upload to Pateron or YT. That would give us all a real insight into how it works 👌
Hi, Did you do the light modification for the tuning panel? Also I have just bought one and notice the FM dial is not in sync with the Fluro LED display? For example dialed all way to left and it only goes to 96mhz and will go no lower as the dial is fully to the left. Maybe it needs re calibrating somehow?? ALso I have no sound from SW bands. FM and MW working but no Shortwave even with outside 80m loop antenna. May be pots need cleaning so I will take apart and de oxit.
Great news. I was wondering about the receiver series. I started with a CR-91A receiver more than 40 years ago. These old receivers are greatly under rated. Cheers!
I must have missed this one ,just watched it and what a brilliant explanation,im quite new at this and if you cant understand something you tend to put it to one side watching this has put my brain into 2nd gear, regards from across the pond 👍🇬🇧
