electrocardiogram ecg project circuit

The alarm circuit diagram for safety box and other metal objects

When an individual touches the safety box or other protected metal objects, the sensor circuit generates a pulse to the alarm circuit. The positive edge of this pulse activates the semiconductor and thyristor flash GE, subsequently triggering the camera to...

USB Powered Audio Power Amplifier

This circuit of multimedia speakers for PCs features a single-chip design, operates on a low-voltage power supply, is compatible with USB power, and allows for easy heat dissipation. The multimedia speaker circuit is designed to enhance audio output for personal computers,...

Amplifier Cool-Down Circuit Circuit

This cool-down relay circuit utilizes an integrated circuit (IC) timer to control a relay, which maintains the operation of the blower for a specified time delay determined by timer U3. The capacitance value of C2 can be adjusted to either...

General-Purpose Output Amplifier Circuit

This general-purpose amplifier has a bandwidth of approximately 20 MHz and it uses an LM733/NE592 video amplifier integrated circuit. This circuit can be utilized as a line driver or as a LAN line driver. The circuit employs the LM733/NE592 video amplifier...

Field disturbance sensor-alarm

The change in ambient light triggers the alarm by changing the resistance of LDR1 and LDR2. The circuit utilizes two light-dependent resistors (LDR1 and LDR2) to detect variations in ambient light levels. LDRs are passive components that exhibit a change in...

Amplifier Timer Circuit Schematic

This circuit turns off an amplifier or any other device when a low-level audio signal fed to its input is absent for at least 15 minutes. Pressing P1 switches the device on, supplying power to any appliance connected to SK1....

Gate automatic lamp circuit

The circuit utilizes multiple integrated circuits to form an automatic lighting device that is activated by door and window sensors. It includes CD4093 digital integrated circuits, a relay, and a power supply circuit. The system typically remains closed when a...

Tv-audio-amplifier

The amplifier captures the audio output signal from the TV and amplifies it to drive a set of earphones for private listening. It is constructed using an LM324 quad operational amplifier and an LM386 low-power audio amplifier. The circuit employs...

audio circuits 20

The gain of the single-stage virtual earth amplifier IC1 is determined by the drain-source resistance of the field-effect transistor (FET). Resistors R1, R2, and R3 linearize the FET's voltage-current characteristic. A control voltage is derived from the output signal using...