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[@afrotechmods](/creator/youtube/afrotechmods)
"How to protect circuits from reversed voltage polarity"  
[YouTube Link](https://youtube.com/watch?v=IrB-FPcv1Dc) [@afrotechmods](/creator/youtube/afrotechmods) 2011-12-02T07:03Z 810K followers, 2.4M engagements


"Basic Electricity - Power and watts"  
[YouTube Link](https://youtube.com/watch?v=VSpB3HivkhY) [@afrotechmods](/creator/youtube/afrotechmods) 2016-11-30T03:01Z 810K followers, 736.2K engagements


"THE BEST Multimeter tutorial (HD)"  
[YouTube Link](https://youtube.com/watch?v=bF3OyQ3HwfU) [@afrotechmods](/creator/youtube/afrotechmods) 2010-03-18T23:55Z 810K followers, 6.1M engagements


"What is a schottky diode"  
[YouTube Link](https://youtube.com/watch?v=bXEyCf1P0UU) [@afrotechmods](/creator/youtube/afrotechmods) 2015-05-29T18:29Z 810K followers, 2.3M engagements


"🔋 Battery amp-hour watt-hour and C rating tutorial"  
[YouTube Link](https://youtube.com/watch?v=cxkVxi9P0EA) [@afrotechmods](/creator/youtube/afrotechmods) 2014-09-25T17:39Z 810K followers, 1.7M engagements


"What is a zener diode"  
[YouTube Link](https://youtube.com/watch?v=xSQHfsHTS88) [@afrotechmods](/creator/youtube/afrotechmods) 2015-06-14T20:54Z 810K followers, 1.2M engagements


"What is PWM Pulse Width Modulation tutorial"  
[YouTube Link](https://youtube.com/watch?v=YmPziPfaByw) [@afrotechmods](/creator/youtube/afrotechmods) 2008-11-16T01:58Z 810K followers, 685.5K engagements


"🔊 How to make an LM386 audio amplifier circuit"  
[YouTube Link](https://youtube.com/watch?v=4ObzEft2R_g) [@afrotechmods](/creator/youtube/afrotechmods) 2017-01-17T16:40Z 810K followers, 707.9K engagements


"Basic Electricity - What is an amp"  
[YouTube Link](https://youtube.com/watch?v=8gvJzrjwjds) [@afrotechmods](/creator/youtube/afrotechmods) 2011-10-24T04:42Z 810K followers, 2.5M engagements


"Basic Electricity - Resistance and Ohm's law"  
[YouTube Link](https://youtube.com/watch?v=NfcgA1axPLo) [@afrotechmods](/creator/youtube/afrotechmods) 2016-11-07T23:38Z 810K followers, 2.7M engagements


"🔌 Basic Electricity - What is voltage"  
[YouTube Link](https://youtube.com/watch?v=TBt-kxYfync) [@afrotechmods](/creator/youtube/afrotechmods) 2016-10-03T16:59Z 810K followers, 1.4M engagements


"Voltage divider tutorial"  
[YouTube Link](https://youtube.com/watch?v=XxLKfAZrhbM) [@afrotechmods](/creator/youtube/afrotechmods) 2010-01-11T05:30Z 810K followers, 662.5K engagements


"Diode Tutorial & How to build an AC to DC power supply"  
[YouTube Link](https://youtube.com/watch?v=cyhzpFqXwdA) [@afrotechmods](/creator/youtube/afrotechmods) 2010-11-19T09:18Z 810K followers, 3.8M engagements


"You can learn Arduino in XX minutes"  
[YouTube Link](https://youtube.com/watch?v=nL34zDTPkcs) [@afrotechmods](/creator/youtube/afrotechmods) 2017-03-17T19:58Z 810K followers, 10.3M engagements


"What is an op amp Operational Amplifier tutorial & super spy microphone circuit"  
[YouTube Link](https://youtube.com/watch?v=TQB1VlLBgJE) [@afrotechmods](/creator/youtube/afrotechmods) 2009-12-16T03:06Z 810K followers, 893.8K engagements


"Capacitor Replacement Tutorial"  
[YouTube Link](https://youtube.com/watch?v=YCSNWi3UHf4) [@afrotechmods](/creator/youtube/afrotechmods) 2008-10-26T00:46Z 810K followers, 2.4M engagements


"Function Generator Tutorial: What is a Signal Generator / Function Generator"  
[YouTube Link](https://youtube.com/watch?v=mLKPwWGBtIw) [@afrotechmods](/creator/youtube/afrotechmods) 2008-11-03T02:55Z 810K followers, 258.1K engagements


"Comparator tutorial & clapper circuit"  
[YouTube Link](https://youtube.com/watch?v=y0Q0ERSP24A) [@afrotechmods](/creator/youtube/afrotechmods) 2010-12-30T05:59Z 810K followers, 452.4K engagements