Wiring Schematic diagram: project

Thursday, November 13, 2014

TDA7275A bassed DC motor speed controller project with explanation

Using the TDA7275A linear integrated circuit designed in a minidip plastic package can be designed a very simple speed regulator electronic project that can be used for speed regulation of small DC motors .

TDA7275A DC speed controller project is intended for use as speed regulator for DC motors of record players, tape and cassette recorders.
This DC motor speed controller circuit project can provide a maximum output current of 1.5 amperes .

Supply voltage range that is accepted for this DC motor speed regulator project is between 8 and 18 volts . V2 is typically 1.5 volt for Motor ”Run” (Acc. Following data or open) and 1 volt for Motor ”Stop” (Acc. Following data or grounded) .

Police Lights associate crystal rectifier Project

This circuit uses a 555 timer that is setup to each runn in associate Astable operative mode. This generates a nonstop output via Pin three within the type of a sq. wave. once the timers output changes to a high state this triggers the a cycle the 4017 4017 decade counter telling it to output consecutive sequent output high. The outputs of the 4017 ar connected to the LEDs turning them on and off. Schematic
Parts List

1x - NE555 Bipolar Timer
1x - 4017 Decoded Decade
6x - 1N4148 Diode
1x - 1K Resistor (1/4W)
1x - 22K Resistor (1/4W)
2x - 4.7K Resistor (1/4W)
6x - 470 Resistor (1/4W)
1x - 2.2µF Electrolytic Capacitor (16V)
2x - BC547 NPN Transistor
2x - LED (Blue)
2x - LED (Red)
1x - 9V Voltage Battery

VHF UHF HF active antenna electronic diagram

A very simple and efficiency active antenna electronic project can be designed using this electronic schematic circuit that is based on transistors. This active antenna electronic project is useful for a wide range of RF frequencies covering three RF bands HF , VHF and UHF . This simple active antenna is designed to amplify signals from 3 to 3000 MegaHertz, including three recognized ranges: 3-30Mhz high-frequency (HF) signals; 3-300Mhz veryhigh frequency (VHF) signals; 300-3000MHz ultra-high (UHF) frequency signals.

This HF VHF UHF active antenna contains only two active elements : Q1 (which is an

MFE201 N-Channel dual-gate MOSFET) and Q2 (which is an 2SC2570 NPN VHF silicon transistor). Those transistors provide the basis of two independent, switchable RF pre-amplifiers. Two DPDT switches play a major role in this circuit , switch S1 used to select one of the two pre-amplifier circuits (either HF or VHF/UHF) and switch 2 is used to turn off the power to the circuit, while coupling the incoming RF directly to the input of the receiver.This circuit must be powered from a simple 9 volt DC power circuit ( or a 9 volts battery) and is very useful for use as an indoor antenna
S2 is useful to give to receiver nonamplified signal access to the auxiliary antenna jack, at J1, as well as the on-board telescoping whip antenna.

Wiring Schematic diagram

Thursday, November 13, 2014

TDA7275A bassed DC motor speed controller project with explanation

Friday, November 7, 2014

Police Lights associate crystal rectifier Project

Thursday, October 30, 2014

VHF UHF HF active antenna electronic diagram