Designing a CC LED driver – Following on from Part 1, I design some code for a Microchip dsPIC33FJ16GS502 microcontroller to user the high speed PWM module to drive a high power LED at a constant current.
Constant Current DC-DC LED Driver Design – [Link]
The digital multimeter (DMM) is an essential tool in every electronic enthusiasts arsenal.
SparkFun How to use a Multimeter – [Link]
Dave explains why some designs have electrolytic capacitors connected in parallel. The answer is more in-depth than you might think.
9 reasons are given and explained, and then some thermal camera fun on the bench.
EEVblog #742 – Why Electrolytic Capacitors Are Connected In Parallel – [Link]
Teardown, Repair and Analysis of an Anritsu MS2721A 7.1GHz Portable Spectrum Analyzer – [Link]
Dave talks about Tektronix’s new unreleased AGO3000 Gravity Compensated Oscilloscope with a high precision TCXO timebase with 2G tip-over gravity compensation.
eevBLAB #8 – New Tektronix AGO3000 Oscilloscope – [Link]
The most often requested video! In this tutorial Dave explains what Operational Amplifiers (OpAmps) are and how they work. The concepts of negative feedback, open loop gain, virtual grounds and opamp action. The comparator, the buffer, the inverting and non-inverting amplifiers, the differential amplifier, and the integrator circuit configurations are also explained.
Then a practical breadboard circuit to demonstrate a virtual ground and the effect of voltage rail limitations.
OpAmps Tutorial – What is an Operational Amplifier? – [Link]
Keithley 2460 Source Measure Unit (SMU) Review, Teardown and Experiments – [Link]
by w2aew @ youtube.com
The Vbe Multliplier circuit, also known as an Amplified Diode or Adjustable Diode, is a useful circuit that allows you to set a user desired voltage drop without using a series combination of diodes or zeners. This video describes and demonstrates how this circuit works, and shows a few applications where it is used. It is commonly used to set the bias on a low-impedance push-pull output stage of an amplifier. All transistors shows are typical general purpose devices like the 2N3904/2N3906. The scope is being used as a simple curve tracer in the first part of the video.
Basics of a Vbe Multiplier: what it is, how it works & where it is used – [Link]
Teardown, Repair and Analysis of an HP 8562B 22GHz Spectrum Analyzer – [Link]