FREE CIRCUIT DIAGRAMS 4U: Clap Relay

Free Electronic Circuits,Schematic Diagram,Circuit Diagrams

Thumbnail image that says sleek button using photoshop that links to a Photoshop tutoril.

free, electronic circuit, circuit diagram, circuit schematic, schematic diagram, electronic diagram, audio, amplifier, power supply, guitar effect, current loop, current limiter, video, receiver, transmitter, transceiver, transistor, radio frequency, rf, active filters, digital, analog circuit, pwm, micro controller Free download

Electronic Circuit,Schematic Diagram,Circuit Diagrams

electronic circuit, circuit diagram, circuit schematic, schematic diagram, electronic diagram, audio, amplifier, power supply, guitar effect, current loop, current limiter, video, receiver, transmitter, transceiver, transistor, radio frequency, rf, active filters, digital, analog circuit, pwm, micro controller Free download

Wednesday, August 26, 2009

Clap Relay

This circuit was intended to activate a relay by means of a hand clap. A further clap will turn-off the relay. An interesting and unusual feature of this project is the 3V battery operation. The circuit's sensitivity was deliberately reduced, in order to avoid unpredictable operation. Therefore, a loud hand clap will be required to allow unfailing on-off switching.

Clap Relay

Parts:
R1,R6___________12K 1/4W Resistors R2_______________1M 1/4W Resistor R3,R9____________6K8 1/4W Resistors R4_____________220K 1/4W Resistor R5_______________2M2 1/4W Resistor R7,R10_________100K 1/4W Resistors R8______________22K 1/4W Resistor C1,C3__________220nF 63V Polyester Capacitors C2,C4,C5________22nF 63V Polyester Capacitors C6______________47µF 25V Electrolytic Capacitor D1,D2_________1N4148 75V 150mA Diodes IC1_____________7555 or TS555CN CMos Timer IC Q1_____________BC550C 45V 100mA Low noise High gain NPN Transistor Q2,Q3__________BC328 30V 800mA PNP Transistors MIC1___________Miniature electret microphone SW1_____________SPST Switch RL1_______________5V DIL Reed-Relay SPDT (See Notes) B1________________3V Battery (2 x 1.5V AA, AAA Cells in series etc.) Q1 acts as an audio amplifier. IC1 timer, wired as a monostable, provides a clean output signal and a reasonable time delay in order to allow proper switching of the following bistable circuit. A discrete-components circuit formed by Q2, Q3 and related parts was used for this purpose, in order to drive the Relay directly and to allow 3V supply operation.
Notes: * A small DIL 5V reed-relay was used in spite of the 3V supply. Several devices of this type were tested and it was found that all of them were able to switch-on with a coil voltage value comprised in the 1.9 - 2.1V range. Coil resistance values varied from 140 to 250 Ohm. * Stand-by current consumption of the circuit is less than 1mA. When the Relay is energized, current drain rises to about 20mA.