120W PMPO PC speaker (reverse engineering)
A long time ago I buy a cheap pear of active PC speaker named SoundSTAR Multimedia Speaker – 120W PMPO. This audio amplifier is made with UTC2025 (similar with TEA2025 – see datasheet) and is...
Author: Nicu FLORICA
5+1 led vu-meter with AN6884
AN6884 is 5-dot led driver circuit with logarithmic scale (dB), who can be used in this configuration: I made a quick test montage: Also, I made AN6884 on test board movie: I want t...
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...
Power supply with LM317 (1,3-25V/max.3A)
A good and simple lab power supply can made easy with LM317 and few componennts, like this schematic from an old roumanian almanac TEHNIUM 1990: Original article is: My power supply is: With an...
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...
Automat de scara (releu de timp cu impuls)
Majoritatea blocurilor au “automate de scara” care prin apasarea unui buton aprinde becurile de la etaje o perioAda de 2-3 minute.. In revista TEHNIUM INTERNATIONAL- martie 1999, este articolul “Automat de scara”, scris de...
Noise/Voice Surveillance System (unisens intercom)
For hear talks or watch the sound I use a simple audioamplifier like LM386, in this case is a special configuration – 74dB amplifier (see article How to get 74dB by LM386)....
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This site has an youtube channel when you see last movies with Arduino, CMOS or simple electronics experiments.. See https://www.youtube.com/user/dj06ntm
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