16 Watt Power Amplifier Circuit parts: U1 U2 LM383 8 watt audio amplifier ic R1, R3 220 ohm resistor R2, R4 2.2 ohm resistor R5 1 megohm resistor R6 100k audio taper potentiometer C1, C7 10uf electrolytic capacitor C2, C5 470uf electrolytic capacitor C3, C4, C6 0.2uf ceramic capacitor SPKR1 4 to 8 ohm speaker [...]
2+x+40+watts+fluorescent+tube
This is a similar circuit to the above and provides a 4 LED bar graph indicating the voltage of a common 3.6 volt Lithium – Ion recharable cell phone battery. The reference voltage is provided by a TL431 programmable voltage source which is set to 3.9 volts where the TL431 connects to the 1K resistor. [...]
12Vdc to 9,7.5,6 Vdc circuit This simple converter using a Zener diode and a transistor into a 9V DC 12V DC battery power to the maximum 1A. The circuit is very simple to build, and requires only 3 electronic components, resistors, zener diodes and transistors. The 2N3055 transistors, 1N4738A Zener diode or Zener voltage and the [...]
This Sensor circuit was designed as an aid in parking the car near the garage wall when backing up. LED D7 illuminates when bumper-wall distance is about 20 cm., D7+D6 illuminate at about 10 cm. and D7+D6+D5 at about 6 cm. In this manner you are alerted when approaching too close to the wall. All [...]
This is a really small alarm that could easily fit inside a pocket. However, I also demanded reliable operation, simple construction and very low power consumption. I started with CMOS logic gates, but was soon forced to abandon the concept after a few unsuccessful (and far too complicated) takes. Then I suddenly realized that a [...]
