Indicator luminos al tensiunii retelei cu led bicolor
Acest articol mi-a fost publicat in revista Tehnium nr. 1 din 1997…
Category: Light
PIR Motion Sensor Module (study and reverse engineering)
PIR Motion Sensor module are used for control lights or for alarm systems. I study a PIR module for light control. I try to made reverse engineering, but quickly I found the schematic on...
Traffic light with CD4017 (part two)
For a simple crossroad, you can made a simple trafic light for cars and pedestrians (passers). In schematic lights 1, 2 & 3 are for traffic ligths for cars who go from bottom to top...
Traffic light with CD4017
For made a simply trafic light you can use a CD4017 who is Decade Counter with 10 Decoded Outputs. Also, it use CD4093 as tact generator. For made traffic light must decoder module made with...
CD4017 = CMOS decade counter with 10 decoded outputs
CD4017 is most used from CMOS 4000 series, because can be used in many applications (hobby, diy, industrial, etc). First, you must study datasheet of this integrated circuit, when you will see pinout for...
LED bulb for solder gun
I use an old solder gun for made quickly some montages who is equipped with 6,3V incandescent bulb. So, Inadvertently, I broke the bulb. Because, I want to quick solve the problem, inspired by my...
3W 230V Watch lamp with LEDs (reverse engineering)
A few years ago, I buy with 0,8EUR an 230V watch lamp with 4 leds. I made reverse engineering for this lamp: I made few calculations: R2 Resistor is put for limit power-up current,...
Lantern with 3 leds (reverse engineering)
I buy a chinesse lantern with 3 leds who is powered by 2 AA bateries. If power directlly a white led at 2 AA bateries, led will lit very low or not lit, but...
Monostable relay with 555
A practical application for monostable relay is temporary stair lights. After you short push on a button, light is on for few seconds (or minutes), after that lights is off. In roumanian old magazine...
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