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555 traffic light
I've got question.. is it possible for us to use only 555 to control 3 LED (Red, gree, yellow). Every LED turn on 1 second, then off.
The order is
RED= On (1second), Green & Yellow = Off
Green=On(1second),RED & Yellow = Off
Yellow=on(1 second), RED & Green= Off
I'd like to build prepayment power metereng for my boarding house(smaal appartment). The Idea is every room has Prepaid power metering like prepaid in mobilephone. Every room buy amount of power. For example room A buy 100kW = $100 (the price only my illustration). After payment, the...
I have a problem programming old microcontroller type AT89S51. I have two variable a (8bit) and b(8bit), i want to merge it to be 16bit data. the a variable A become upper bit and B variabel as lowerbit. How to merege and store it in AT89S51? Is there any register in AT89S51 that can...
I try to build pulp tester using simple circuit. The Idea is create a current sourcer about 42 mA and add it with triangle wave 130Hz 6v. The problem is how to combine it? using simple adder? If i succes make current source with output 42 mA..then if I add it with the triangle wave...
how to measure kv
I wonder how to measure current in high voltage power supply without special measure tool?is it possible to use general voltagemeter. because the output about 200 kV(DC). actually, i want to know is the power suply is working. so how to make it measureable using...
how to measure water flow and pressure
I wonder how to measure water flow in the pipe that buried underground? i want to make tools
that can monitoring the velocity of fluid that flow in the pipe and send digital data to PC
(real time monitoring)? what kind of sensor that i can use...
i try build analog PID controller using opamp, after finished i test it. when input PID is 0V why the output become 10 volt? how to check if my PID it's work? is there any metode to tuning PID? plese give me some reference? thanks
PS: i test the plant and it works well.
motor dc 10.000 rpm indonesia
i've got task to measure RPM for motor dc. the motor has RPM about 10.000 RPM. What kind of sensor i can use? optocoupler or Photodiode or hall effect sensor? to measure high speed RPM?Why?
coaxial cable impedance
I need a coaxial cable with impedance 50 Ohm. After looking at my local electronic store there is only 75 Ohm Coaxial cable. Is there any way to converting 75 Ohm Coaxial Cable into 50 Coaxial Cable ?? perhaps by adding some circuit?? Please help me. Thanks...
i have task to build electronic plant that reprensetate second order using opamp+resistor+capacitor. before i build i, i try to simulate it using electronic software like PROTEL DXP 2004 and Circuit maker 6.0. Unfortunatelly, the respon like overshoot, error steady state don't appear at...
i got project from my control system teacher...he ask me to find simple scematic that represent second order electronic
plant. is there anyone that can helpme. please give me some explanation too...
how to discharge a tv
Yesterday my color TV getting trouble. I want to check it by my self. But, my friend ever told to becarefull when we repair the TV coz there is high voltage in the tube of TV eventhough we have unplug the main power . Is it true? So, Is there any way to discharge...
i'm curious what is the function of Capacitor after diode bridge in power supply. How it work?when the capacitor charge and discharge? my friend ever told me that the capacitor only charged(never discharge). he said that when capacitor start to discharge, it has supplied again by...
ph meter schematic
i'll plan to make a pH meter for my school project...but i don't have any idea about how to measeure the pH. is anyone can help me...give me some reference, schematic, or anything...please