Here’s the circuit for a simple electronic delay detonator circuit diagram. The overall circuit is in a hybrid IC module. This is the figure of the circuit;
Wednesday, May 25, 2011
Op Amp Based Sound Detector Circuit
Here’s a circuit for detecting sounds and providing an output signal when a sound is detected. This output signal may be fed to another circuit that sets off an alarm when the signal is received. This circuit is therefore useful in security applications. The circuit uses a condenser microphone to pick up sounds from the environment. This is a powered microphone, which makes it more sensitive than ordinary microphones. This is the figure of the circuit;
The microphone transforms the sound waves into an electronic signal that is fed to the 741 op amp. The 741 op amp in this circuit is configured as a single-supply inverting amplifier. Adjust R1 to maximize the sensitivity of your circuit. C1 and C2 are used to block the DC component of the signals, so that only the AC component carrying the sound information reaches the output transistor Q1. Note that the output, which is taken from the collector of Q1, is inverted with respect to the output of the 741 amplifier. This output signal may be used as a triggering signal for a 555-based mono stable multi vibrator, which outputs one clean pulse every time it is triggered. This clean pulse, in turn, may be used to trigger a tone generating circuit or alarm.
Wednesday, April 6, 2011
Relay Output Proximity Sensor Circuit
This is a design circuit of relay output proximity sensor that can be used in oscillator. This is the figure of the circuit;
Q1 is used as an oscillator around 300 kHz. R9 is set so that the oscillator just begins to run. An object near the antenna will load the circuit down, and stop the oscillations. This is detected by bufferQ2, diodes D1 and D2, and this activates relay driver Q4, which operates the relay. [Circuit diagram source: Seekic.com]
