Speaker Protection Circuit kit If you are one person at fears a loudspeaker and power amplifier. Be damaged I begs for to advise Speaker Protection Circuit KIT. Convenient for friends at not convenient seek buy the equipment and do PCB by oneself. When you buy this Electronic KIT….

Loudspeaker Protection with Soft Start This is a small protection circuit from loudspeakers, from DC voltage that likely to exist after some damage in the power amplifier. If a DC voltage is presented in the exit of amplifier, RL1 it interrupts immediately the line of loudspeakers preventing thus to reach in he. Parallel it provides a delay time of 3 seconds from the moment where the power supply …

Protection Circuits for Audio Amplifiers he photovoltaic isolator makes for a simple, easy, way to turn the two units on or off because the voltage-source side of the isolator rides along with the source terminals while the LED side may be tied to any level necessary for operation. To turn the “relay”….

Water Level Alarm by 4011 A circuit that offers visual indication of fluid level in a vessel, with a switchable audible alarm. Example uses would be to monitor the level of water in a bath or cold storage tank.
This circuit will trigger with any fluid with a resistance under 900K between the maximum separation distance of the probes. Let me explain further. The circuit uses a 4050B CMOS hex buffer working on a 5 volt supply…..

Water Sensor Alarm Diagram. Monday, February 21st, 2011 … a LED) when the water contained into a recipient has reached the desired level. …

Water Alarm Circuit Diagram Have you ever seen the stairs to one of the upper stories in your house turn into a waterfall? Or maybe you’ve come home to find your aquarium fish trying to swim across the carpet? For your sake, we hope not, because the consequences are usually fairly dramatic…..

Rain Alarm using NE555 This circuit gives out an alarm when its sensor is wetted by water. A 555 astable multivibrator is used here which gives a tone of about 1kHz upon detecting water. The sensor when wetted by water completes the circuit and makes the 555 oscillate at about 1kHz….