2018-06-12 Update: DIY Rheostat
Attach a pencil lead to a small wooden board, attach a wire to one end, and bend the end of the other wire into a small ring and put it on the pencil lead. This is a simple pencil lead sliding rheostat. Connect it in series in the circuit, move its active end, you can change its resistance value in order to control the current in the circuit.If you need to change the resistance in a larger range, put a few pencil leads in series with the resistor above (see pic ).Its much easier to start experim...
View More >>2018-06-11 Update: DIY Hand Crank Generator
Materials: Differential, Motor, Wooden board, Empty Pen Refill, Saw Blade, Blade, Electrical DrillDifferential: it is not possible to shake much electricity without this. This is for speed increasing. Hand rotation for one cycle is equivalent to a few laps of the motor rotation.Install the motorA wooden board and a sawbladeUse a saw blade to make the size as you need.Then use a blade for fine processing, you can also use sandpaper to make smooth.Holes were drilled without electric drill, it ...
View More >>2018-06-11 Update: Simple Infrared Sensor Switch
Simple Infrared Sensor Switch- Required components- Circuit schematic- Using STC12C4052AD or STC12C2052AD(1pcs) for microcontroller- LTH1550-01 Infrared Reflector Module (1pcs)- Other infrared reflectors module of the same type can be used instead (such as RPR220)- Can be replaced with the same type of module-LED for output indication, the pin expandable relay or other output (1pcs)- Breadboards (1pcs)- Battery case for 3 AAA batteries(1pcs)- The output voltage is 4.5V. The red line is positive ...
View More >>2018-06-07 Update: [SCM] Timing power on/off of router
We went to bed every night, and the router worked every day without resting. Its too much trouble to turn off the power every day, finally I found a way to let him rest automatically, so I did this.First, the circuit diagram is as follows:The materialThe process:Make four 4mm diameter holes on 2 hole boards (size 7*5), as shown in pic:Six holes with a diameter of 3mm are drilled on one of the board. as in the pic:Solder the hole board with digital tube, as shown in pic:The obverseside:The re...
View More >>2018-06-06 Update: DIY socket tester, essential for home inspection
You may be worried the wiring is not correct if you just finished decorating your house: may get an electric shock or leakage. Dont worry, now were going to make a socket tester that will specifically detect the line sequence of the socket and ensure that it is the correct wiring.Led display tableHere the principle I will explain:(1) The wiring is correct: because the neutral line and the live line are conducting, the led2 is on. Because the earth wire is grounded, there will be a sm...
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