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CA3140 and CA3130 Special Opamps

Mon, 26/08/2024 - 11:46am by deadmin

Analog Design

CA3140 and CA3130 are originally RCA part numbers( i feel). They are amazing close to ideal opamps, the input offset has to be trimmed. I used to use it when high input impedance is required. 1.5T ohm 10pA is the specs. A Electrometer can be made with just one opamp.

CA3130 has the additional Merit of swinging to the rails, if you are on a +/- 12V supply, the output will be +/-12V. This is a feature required in control applications.nn

CA3140 -4.5MHz, BiMOS Operational Amplifier with MOSFET Input/Bipolar Output

Integrated-Circuits

Surge Protection and Lightning Arrestors

Mon, 26/08/2024 - 3:57am by deadmin

Resources

Supplementary to EMI/RFI/EMC Immunity of an Equipment. Many Installations are subject to Highly Disruptive Electrical Environment not just EMI. Depending on the budget and the situation a solution has to be found. Sometimes a CVT or an Isolation Transformer can do a lot of good.

Converting all Energy inputs to battery energy and having a Isolated Synthetic Sine Supply may be an expensive but good solution. Either way the devices that face the harsh environment have to be over rated along with these protections. - delabs design Notes

ESD-EMI-RFI

Electrical Safety Code Manual

Fri, 23/08/2024 - 2:19am by deadmin

Resources

In the case of the electrical industry, safety is critical and the codes and regulations that determine safe practices are both diverse and complicated. Employers, electricians, electrical system designers, inspectors, engineers, and architects must all comply with safety standards listed in the National Electrical Code, OSHA and NFPA 70E.

Electrical Safety Code Manual

Tech-Reference

Maintenance of Temperature Measurement Devices

Tue, 20/06/2023 - 3:34pm by deadmin

Process Control

There are many different types of temperature measurement devices, each one tailored to meet a specific need. This fact sheet provides information on the types, use, and calibration of temperature measuring devices. It also provides guidelines for the selection and proper maintenance of common thermometers and temperature sensors.

Selection and Maintenance of Temperature Measurement Devices

Sensors

BC557 PNP Transistor General Purpose

Thu, 15/06/2023 - 6:29am by deadmin

Resources

BC556, BC557 and BC558 PNP Amplifier Transistors are not only popular today but very ancient, it is used as a General Purpose device and a popular LED control in small products.

This Silicon device along with some others replaced Germanium Devices in Preamplifiers and Portable Transistor Radios  and Portable Tape Recorders. A Complement is the BC547B NPN General Purpose Transistor. Now for Specs 45V, 100mA, 200 beta approx.

Discretes

CD4093BC Quad NAND Schmitt Trigger

Wed, 14/06/2023 - 12:46pm by deadmin

Resources

The CD4093B consists of four Schmitt-trigger circuits. Each circuit functions as a 2-input NAND gate with Schmitt-trigger action on both inputs. The gate switches at different points for positive and negative-going signals.

The difference be-tween the positive (VTa) and the negative voltage (VTb)isdefined as hysteresis voltage (VH). All outputs have equal source and sink currents and con-form to standard B-series output drive.

Integrated-Circuits

74HCT373 Octal transparent D-type latches

Tue, 24/01/2023 - 10:51am by deadmin

Resources

74HCT373 - High Speed CMOS Logic Octal Transparent Latches with 3-State Outputs. The 'HCT373 devices are octal transparent D-type latches. When the latch-enable (LE) input is high, the Q outputs follow the data (D) inputs. When LE is low, the Q outputs are latched at the logic levels of the D inputs.

What it can do ? - This is like a Byte of Memory, A Byte means 8 Bits. A Bit Means one Input or Output Pin of an IC, Which understands Logic 1 is High and Logic 0 is Low.

Integrated-Circuits
Interface-Circuits

SPM-3 Heterodyne Level Meter

Wed, 26/01/2022 - 4:30am by deadmin

Test Instrumentation

The SPM-3 is a broadband and heterodyne level meter whose frequency range is is designed for balanced 1 20-channel systems. It can be powered from a built-in rechargeable rechargeable battery or from the mains. Buffer operation is also possible. possible.

The unit is easily transportable and simple to operate, making it well suited for the and is therefore well suited for the maintenance service.

Tech-Reference

Basic Analog for Digital Designers

Tue, 12/10/2021 - 12:00pm by deadmin

Analog Design

There is a long gap between engineering college and mid career in a non-engineering position, but technology marches on so a simple method of keeping abreast with the latest developments is required. This application note starts with an overview of the basic laws of physics, progresses through circuits 1 and 2, and explains op amp operation through the use of feedback principles.

Basic Analog for Digital Designers - Application Note an9510

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