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Because I’m old school, I wanted to build a Garage Door Closing circuit without relying on integrated configurations (555 timer etc) to keep it simplistic. The circuit closes the garage door after two minutes with C3 and four minutes with the addition of C2. The timer relay is surprisingly accurate (+/- five seconds). Another feature is to ensure that the garage door actually did close, such as if it’s stopped mid-operation by the user. Description: S3 (magnetic N.C.) is located at the garage door and activates the circuit when the garage door opens. RL1 is the reset timer. It’s maintained in the “on” position for two minutes by C3 while the trigger capacitor, C4, is charged. RL2 is the conduit, directing C4 to either RL3 or R1 to ground when off. Purpose of R1 is to prevent arching across contacts and a fast discharge. RL3’s contacts are connected to the Garage Door’s Momentary Switch and is sustained “on”  for a half second by C5. When C3 discharges to the cutoff voltage of RL1, ...

This is the schematic diagram of 3 channels audio splitter amplifier circuit which built using op-amp IC TL084. The 3 channels amplifier output distribution applies a single TL084.   3 Channels Audio Splitter Amplifier Circuit Diagram The very first step is to capacitive coupling having a p. 1.0 ~ electrolytic capacitor. The entries are railways Vee Y2 or 4.5 V. This enables working with an individual 9V power source. A voltage gain of 10 (1 M?/100 Kohm) is obtained in the first stage, as well as the other three floors are connected as a unity gain voltage followers. Every single output stage drives independently through an amplifier output 50 pF capacitor towards the resistance of 5.1 k ohm load. The response range is flat from 10 Hz to 30 kHz.

In this circuit power supply is given by Pressing switch Sw(1).when we press the Sw(1) it shorts the N/O contact of relay RL(1) which gives the supply to our circuit.The current which passing thorough resistor R8 gives the base current to transistor T5.Where the transistor T2 and T3 are making darlington pair. A darlington pair has various applications associated with it and one of them is to use it as a switch. As the transistor's collector current is proportionally limited by its base current, it can be used as a current-controlled switch.And transistor T4 ON when over or under voltage is given to transistor T3. Where capacitor C2 is used for avoiding noise.where capacitor C2 with resistor R10 making a low pass filter which also gives us sufficient time delay. There is a resistor network(VR1,R11,R12) which is used as a current sensor.Where zener diode ZD1 and ZD2 are used for the over voltage protection. where capacitor C1 used as a noise filter of switching circuit and Diode D3 ...

This is a circuit solar charger via USB cable emergency , it is an alternative circuit that uses solar cell and LM317 to regulate and make a recharge via USB for electronic equipment that can be IPODs , cell phones, MP3 , tablets , etc. .   The simplicity of the circuit can be noted that he does not have much appeal, but it's enough to make a simple battery charge . The Solar Cell should be 12v current should be enough for loading , 10 % of the batteries .   Battery Charger Circuit using Solar Cell Circuit Diagram

This  Battery Charger Electronic circuit Project   An LM317 voltage regulator is configured as a constant-current source. It is used to supply the 50 mA charging current to S01-S06, an array of AA-cell battery holders. Each of the battery holders is wired in series with an LED and its associated shunt resistor. Battery charger using LM317 Circuit Diagram: When the battery holder contains a battery, the LED glows during charging. Each battery holder/LED combination is paralleled by a 5.1-volt Zener diode. If the battery holder is empty, the Zener conducts the current around the holder. A timing circuit prevents overcharging. When power is applied to the circuit, timing is initiated by IC2, a CD4541 oscillator/programmable timer. The output of IC2 is fed to Ql. When that output is high, the transistor is on, and the charging circuit is completed. When the output is low, the transistor is off, and the path to ground is interrupted. 

This Audio Receiver 433 MHz RF module using circuit diagram is very interesting, it is a module 433mhz RF common of those used in alarm or electronic gate, which was transformed into audio receiver and data simultaneously. The circuit consists of LM386 audio amplifier and the RF module requires a voltage of 4.5 to 5.5 volts and a very small current. Audio Receiver 433 MHz RF module using Circuit Diagram

Dorji Applied Technology from China builds different types of RF modules that can be easily incorporated in designing wireless data loggers, sensor network, telemetry and other wireless applications. Some of their RF modules have an additional pre-programmed microcontroller that allows direct interface of selected analog and digital sensors to the module. This means you don’t need any external MCU or to write codes for these sensors. In this tutorial, Raj from Embedded Lab talks about their DRF5150S and DRF4432S RF modules which are very versatile and easy to use for wireless sensor applications. For illustrative purpose, Raj shows how to put them together to construct a simple wireless sensor application where data from a remote sensor are received and displayed on a PC, without using any external microcontrollers. [ ]

IC TA7066P is original monolithic Intregated Circuit Audio Power Amplifier. Package IC is SIP10-16 and manufactered by TOSHIBA.  The above sequence is a series of low-grade intregated circuit amplifier , which was very small output . But this amplifier is very high impedance power output. For more details , see description below. Technical information : Min. Voltage   : 8   Volts DC Max. Voltage  : 25 Volts DC Max. Power    : 0,3 Watts Impedance      : 150 Ohms Min. Currents : 2,8 mA