TL082 Gobal chips

Description: This circuit provides either latched switching or timed switching. U1A and U1B provide audio amplification from the microphone, while U2 is a retriggerable monostable multivibrator. S1A and S1B select either U3, a flip-flop, or U2. Resistors R13 and R14 allow for a timer delay of 6 to 60 seconds after the sound ceases in the timed mode. The components BR1, U5, and others form a power supply. Transistor Q1 drives optocoupler U4 and triggers triac TR1. These components are low-cost, high-speed, dual JFET input operational amplifiers with an internally trimmed input offset voltage, utilizing BI-FET II technology. They require low supply current while maintaining a large gain bandwidth product and fast slew rate. Additionally, well-matched high voltage JFET input devices provide very low input bias and offset currents. The TL082 is pin-compatible with the standard LM1558, allowing designers to upgrade the performance of existing LM1558 and most LM358 designs. These amplifiers are suitable for applications such as high-speed integrators, fast D/A converters, sample and hold circuits, and other circuits requiring low input offset voltage, low input bias current, high input impedance, high slew rate, and wide bandwidth. The devices also demonstrate low noise and offset voltage drift.

The reliability metrics for the TL082 series include various failure rates calculated based on rejects and sample sizes for early failure rates (EFR) and long-term failure rates (LTA), using the Arrhenius equation at an activation energy of 0.7 eV and derating the assumed stress temperature of 150 °C to an application temperature of 55 °C.

Design tools available include an Amplifier Selection Guide software for Windows, and application notes on protection schemes for BI-FET amplifiers and switches.

The circuit operates in two modes: latched switching and timed switching. In latched mode, the circuit remains in an active state until manually reset, while the timed mode allows for a delay before deactivating. The audio signals captured by the microphone are amplified by U1A and U1B, which are configured as operational amplifiers. The output from these amplifiers is sent to the retriggerable monostable multivibrator U2, which controls the timing aspect of the circuit.

The selection switch S1A and S1B allows for the choice between the flip-flop U3 and the monostable multivibrator U2, providing flexibility in circuit operation. Resistors R13 and R14 are critical in defining the time delay after the sound has ceased, ensuring that the circuit can cater to various application requirements.

The power supply section, composed of BR1, U5, and associated components, ensures that the circuit operates reliably under different conditions. The optocoupler U4 provides electrical isolation between the control and power circuits, while triac TR1 manages the load switching, enabling the circuit to control higher power devices safely.

The TL082 operational amplifiers are particularly advantageous due to their low noise characteristics, making them suitable for audio applications. Their compatibility with existing designs allows for easy integration and upgrading of older systems. The low input bias and offset currents enhance their performance in sensitive applications, ensuring accurate signal processing.

Overall, the circuit design emphasizes reliability, flexibility, and performance, making it suitable for a range of applications requiring precise audio signal amplification and controlled switching capabilities.This circuit provides either latched switching or timed switching. U1A and U1B provide audio ampliftcation from the microphone, U2 is a retriggerable monostable multivibrator. S1A and S1B select either U3, a flip flop, or U2. R13 and R14 allow a 6  to 60-second timer delay after the sound ceases, in the timed mode ‚BR1, U5, and associated components

form a power supply. Q1 drives optocoupler U4 andtriggers triac TR1. These devices are low cost, high speed, dual JFET input operational amplifiers with an internally trimmed input offset voltage (BI-FET II ™ technology). They require low supply current yet maintain a large gain bandwidth product and fast slew rate. In addition, well matched high voltage JFET input devices provide very low input bias and offset currents.

The TL082 is pin compatible with the standard LM1558 allowing designers to immediately upgrade the overall performance of existing LM1558 and most LM358 designs. These amplifiers may be used in applications such as high speed integrators, fast D/A converters, sample and hold circuits and many other circuits requiring low input offset voltage, low input bias current, high input impedance, high slew rate and wide bandwidth.

The devices also exhibit low noise and offset voltage drift. Reliability MetricsPart NumberProcessEFR RejectEFR Sample SizePPMLTA RejectsLTA Device HoursFITSMTTF (Hours)TL082CMBIFET012335009750004276658912TL082CMXBIFET012335009750004276658912TL082CPBIFET012335009750004276658912Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0. 7eV activation energy and derating the assumed stress temperature of 150 °C to an application temperature of 55 °C.

For more information on Reliability Metrics, please click here. Design ToolsTitleSize in KbytesDateAmplifiers Selection Guide software for Windows8 Kbytes6-Mar-2007ViewPlease use Adobe Acrobat to view PDF file(s). ->If you have trouble printing or viewing PDF file(s), see Printing Problems. Application NotesTitleSize in KbytesDate AN-447: Protection Schemes for BI-FET Amplifiers and Switches 76 Kbytes 4-Nov-95 Download Please use Adobe Acrobat to view PDF file(s).

->If you have trouble printing or viewing PDF file(s), see Printing Problems.