Homemade Arduino (Arduiniq ver.3.0)
If you need to use Arduino shield on your projects must use an Arduino Uno or Arduino Mega boards or made your Arduino style development board. Schematic and board was designed using (Autodesk) Eagle PCB...
Monthly Archive: May 2017
Bridging Adapter For Power Amplifiers
If you need more power can use bridging adapter, who must interconect like in this schematic and schematic is very simple I redesign schematic in Autodesk Eagle PCB software: and made a version for...
Pseudo-stereo adapter
TDA3810 is an old spatial, stereo and pseudo-stereo sound circuit who is hard to found, so I search replacement solution. In an old romanian book named “Electronica peste tot’ (Electronics everywhere) writted by mr. I.C.Boghitoiu,...
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...
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...
Recent Comments