A simplified explanation of how a capacitive MEMS accelerometer works.
How an accelerometer works! - [Link]
by EEVblog @ youtube.com:
Want to include a small Lithium Ion or Lithium Ion Polymer battery into your next project? It’s easy! Dave gives you the low down on how they work and how to charge them and select a suitable charging IC.
NOTE: For safety you should always use circuit protected cells as per the larger cell I was holding up. It protects against over-discharge, over-voltage, shorts etc.
(BTW, the reference to Lithium Ion Polymer being the same as Lithium Ion is in terms of charging, if that was not clear. The Ion Polymer type have polymer anode material and hence a different construction that allows the small pouch type cells shown in the video, and other thin odd shapes shown toward the end)
EEVblog #176 – Lithium Ion/Polymer Battery Charging Tutorial - [Link]
Teardown and repair of an Agilent E4433B ESG-D synthesized signal generator:
In this episode Shahriar repairs an Agilent E4433B ESG-D Synthesized Signal Generator. This 4GHz unit shows the “UNLEVEL” error for all frequencies and at all output power levels. After a close look at the system block diagram the fault is traced to the main Output RF board.
Teardown and repair of an Agilent E4433B ESG-D synthesized signal generator - [Link]
Dave reviews the Analog Discovery 14bit 100MS/s USB oscilloscope and multi-function instrument from Digilent.
It has a 2-Channel Oscilloscope
2-Channel Waveform Generator
16-Channel Logic Analyzer
16-Channel Digital Pattern Generator
±5VDC Power Supplies
Network Analyzer with Bode, Nichols and Nyquist plots.
EEVblog #692 – Digilent Analog Discovery Review - [Link]
by TheSignalPathBlog @ youtube:
In this episode Shahriar compares the performance and features of the Siglent SDG5162 and Rigol DG4162 Arbitrary Waveform Generators. Siglent has recently opened a new North America office which would certainly help them bring their instruments to the US more quickly and provide better local customer and sale support.
The Siglent SDG5000 teardown is presented. Aside from various GUI features of these two units, the THD, phase noise and maximum output power of each unit is measured. The ability of the Siglent generator to produce 12ns pulse width independent of the output frequency is also presented with some practical applications. Finally the Easy Wave application us is used to generate some custom waveforms.
Review, Comparison and Teardown of Siglent SDG5162 and Rigol DG4162 Arbitrary Waveform Generator - [Link]
by w2aew @ youtube.com:
This tutorial back-to-basics video discusses the operating point (or quiescent point, Q-point, bias point, etc.) of a bipolar transistor (BJT) circuit, and how the choice of the circuit design can affect how sensitive the bias point will be to the value of Beta (current gain) of the transistor. Ideally, you’d want to use a circuit which is completely independent of beta, so that a wide variety of transistors could potentially be used. Three different transistor bias circuits are demonstrated with three transistors, each with a different value of Beta. The current gain of the three transistors are measured and recorded, and then the resulting voltage ACROSS the collector resistors is measured for each transistor in each configuration. In other words the voltage between VCC and the collector is what is measured and recorded (not the collector voltage with respect to ground).
Bipolar Transistor bias circuits and Beta dependence - [Link]
by TheSignalPathBlog @ youtube.com:
In this episode Shahriar repairs an Agilent 33250A function and arbitrary waveform generator which does not power on. The unit is equipped with a soft power switch which might be responsible for the fault. After a brief look at the unit’s constructions, the fault is traced to a few possible locations.
The schematic of the soft power circuitry is presented and the internal switching power supply is closely examined. After the fault is located, the repair is presented. The block diagram and operation of a current mode DC-DC switching IC is also presented.
Teardown and Repair of an Agilent 33250A Function and Arbitrary Waveform Generator - [Link]
What’s inside a smart card pinpad EFTPOS terminal?
Dave looks at the anti-tamper mechanisms inside a Sagem Monetel EFT930S
EEVblog #687 – EFTPOS PIN Pad Terminal Teardown - [Link]
EEVblog #684 – Ness SMT Manufacturing & Assembly Factory Tour - [Link]
Webinar introduced UDOO as a powerful single board embedded SBC based on the powerful Freescale i.MX6 chip, which offers complete and powerful platform for your applications.
Looking for a powerful platfom for your Linux applications? - [Link]