Today, let's try to fix and restore a vintage soviet TV set Yunost R603 (Юность Р603) from 1981. It's a small portable solid state black & white analog CRT television. During the process, let's also see what's inside and how does it work.
What's inside a 12V cordless power drill / screwdriver. Including the schematic of the motor speed regulator (controller) and an autopsy of the gearbox with its adjustable torque mechanism. It probably had a 3-cell Li-Ion or a 10-cell NiCd battery.
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https://www.youtube.com/watch?v=LroQPn59bWg
I was trying to recharge the disposable one-time single-use power bank (the eco-disaster) from this video:
https://youtu.be/iEmTh1PMQyY
Despite being designed as a one time charger, it appears to contain a rechargeable Li-Ion or Li-Pol cell.
Warning: Batteries (rechargeable or non-rechargeable) may be dangerous. Risk of leakage, fire or explosion at any time, especially when in use, in case of overcurrent, short circuit or when being recharged.
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https://www.youtube.com/watch?v=5n5iVlKo4xw
A quick look what's inside a 14.4V cordless drill battery pack somebody threw away. It turned out to contain 12 NiCd cells in series, 1.2V 1200mAh each, giving 14.4V 1200mAh in total. It's probably an older one, the newer ones contain Li-Ion cells. I'm testing some of the NiCd cells trying to reuse them in a small 2.4V or 4.8V drill.
Update: I analyzed 9 cells at 1C discharge after 1C charge, all were over 1300mAh, more than the rated capacity!
Warning: NiCd batteries contain toxic cadmium. They must be handled and disposed properly.
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https://www.youtube.com/watch?v=drpzKyYVZYA
What's inside a small electricity meter (energy meter, kilowatt-hour meter) that fits on a DIN rail. Finding out it's faulty and fixing it.
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https://www.youtube.com/watch?v=ePN4T7PPTYE
Today, let's boast of my new website - an online calculator for formulas used in electronic circuit designs. It's still under construction. It will be able to calculate the Ohm's law, DC power, AC power, Resistive load power, resistor power dissipation, LC resonant frequency, inductive and capacitive current, inductive and capacitive reactance, wire resistance, wire weight, wire cross section and diameter, LED resistor, capacitor stored energy, and some more calculations...
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https://www.youtube.com/watch?v=1mwiPvwmoiI
Let's see what's inside an LED 3rd brake light from a car and how did it fail.
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https://www.youtube.com/watch?v=nOOZxQ8JAu0
Restoring a BM556 analog oscilloscope made by Tesla in Czechoslovakia in 1982. Fixing broken and stuck front panel controls, things out of alignment, wires coming off, high voltage arcing and even some smoke! Also a brightness control problem, suspecting a worn CRT, fluctuating heater voltage, testing some transistors. The problem with the heater voltage (coming from the HV power supply) still has to be solved, as well as the bad time base or synchronisation.
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https://www.youtube.com/watch?v=JYR6D2rZoQE
Today, let's see what's inside a switching charger for a supposedly 36V 9000mAh Li-ion powered drill / screwdriver. This charger was donated by Voltlog. I review the charger, he reviews the drill and battery packs in his video:
https://youtu.be/kvTozkYbRoI
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https://www.youtube.com/watch?v=euZ6SUrmRI8
In this video you will see a safety test and an autopsy of a cheap portable electric water heater element (immersion boiler) from Ebay.
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https://www.youtube.com/watch?v=G7LhLW7ClDA