Saturday, August 31, 2013
Automatic Automotive Burglar Alarm
Automotive Burglar Alarm Circuit Diagram
Friday, August 16, 2013
18W Car Stereo Amplifier Rise
This project will be useful in applications where the input signal is a low level, without requiring the use of a separate pre-amplifier. This IC module has a built in surge protection circuit, thermal shutdown circuit, ground fault protection circuit & power supply fault protection circuit making it reliable.
D.C. Input : 8 – 18V at 1-2 A
Power output : 18W maximum, 4 ohm load, 18V DC supply
S/N ratio : > 70 dB
THD : < 0.2% @ 1W
Freq. Response : ~ 30 Hz to 30 kHz, –3 dB
Input level : < 25 mV, for full output (G > 50dB)
Input Impedance : ~ 30 k ohm
Most of the circuitry is contained within the amplifier module. C10 is the input coupling capacitor and blocks DC from the input. C11 bypasses any RF which may be present at the input. C1 & C2 provide an AC ground for the inverting inputs of the IC. R1/C7 and R2/C8 provide a high frequency load for stability with difficult speakers. C five & C six provide bootstrap feedback for the IC. C9 & C12 provide power supply filtering.
Thursday, August 15, 2013
Simple Diodeless Rectifier Circuit Diagram
Wednesday, August 14, 2013
Battery Charge Discharge Indicator Circuit Diagram
Tuesday, August 13, 2013
Programmable Gain Amplifier Circuit Diagram
Click here to download DG212.pdf datasheet.
Monday, August 12, 2013
Rj45 Pinout Wiring 10baset 100baset Connection
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Sunday, August 11, 2013
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Saturday, August 10, 2013
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Friday, August 9, 2013
16th Edition Wiring Regulationsdesign Verification
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Thursday, August 8, 2013
A Friendly Charger Circuit for Mobile Phones
Most mobile chargers do not have current/voltage regulation or short-circuit protection. These chargers provide raw 6-12V DC for charging the battery pack. Most of the mobile phone battery packs have a rating of 3.6V, 650mAh. For increasing the life of the battery, slow charging at low current is advisable. Six to ten hours of charging at 150-200mA current is a suitable option. This will prevent heating up of the battery and extend its life.
Circuit diagram:
A Friendly Charger Circuit Diagram For Mobile Phones
Parts:
Resistors:
P1 = 10K LOG
R1 = 1K
R2 = 1K
R3 = 1K
R4 = 1K
R5 = 3.3K
R6 = 16R/2W
R7 = 220R
R8 = 3.3R
R9 = 1K
Capacitors:
C1 = 470uF/25V
C2 = 10uF/25V
C3 = 1KuF/25V
Semiconductors:
D1 = Red LED
D2 = Green LED
Q1 = BC547
Q2 = BD677
ZD1 = 12V/1W
ZD2 = 5.6V/1W
IC1 = CA3130
Description:
The circuit described here, provides around 180mA current at 5.6V and protects the mobile phone from unexpected voltage fluctuations that develop on the mains line. So the charger can be left ‘on’ over night to replenish the battery charge. The circuit protects the mobile phone as well as the charger by immediately disconnecting the output when it senses a voltage surge or a short circuit in the battery pack or connector. It can be called a ‘middle man’ between the existing charger and the mobile phone.
It has features like voltage and current regulation, over-current protection, and high- and low-voltage cut-off. An added specialty of the circuit is that it incorporates a short delay of ten seconds to switch on when mains resumes following a power failure. This protects the mobile phone from instant voltage spikes. When short-circuit occurs at the battery terminal, resistor R8 senses the over-current, allowing Q1 to conduct and light up D1. Glowing of D2 indicates the charging mode, while D1 indicates short-circuit or over-current status.
The value of resistor R8 is important to get the desired current level to operate the cut-off. With the given value of R8 (3.3 ohms), it is 350 mA. Charging current can also be changed by increasing or decreasing the value of R7 using the ‘I=V/R’ rule. Construct the circuit on a common PCB and house in a small plastic case. Connect the circuit between the output lines of the charger and the input pins of the mobile phone with correct polarity.
Author : D. Mohan Kumar Copyright : E F Y
Tuesday, August 6, 2013
Subwoofer Speaker Level Input Output Connection
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