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The best way to identify the resonant is to measure the current through the inductor. The inductor current is maximum at resonant. So you can sweep the frequency until the inductor current reaches the peak. You can do that either measuring the inductor voltage or place a shunt resistor in series...
What size is your wearable device? Do you know what is the current consumption? Most of today’s wearable devices (non-medical, iWatch for example) use lithium ion batteries. If the device is small and high current consumption, you don’t have much choice but go with lithium batteries.
It is not straight forward to measure the current accurately without a shunt resistor. One solution is to measure the voltage drop across the diode D1. To do that, you need to know (or characterize) the diode voltage vs. current. This current measurement may not be very accurate, but good...
Audioguru is right. You need to be careful when charging lithium batteries.
Gaura, to charge two lithium ion (Li+) batteries in series, you need a specific battery charger that is designed to charge two series Li+ batteries. In addition, each battery cell needs to be balance. Balancing...
Thank you everybody for the recommendation. My board is device-only and not host. My board need to connect to a computer to read/write data. I am not sure if R-pi can support device-only mode. Looks like Microchip products is the best bet.
I did not see anyone recommend Arduino. I heard...
Can anyone recommend an easy to use and easy to program USB-capable micro-controller? I am new to the field of microcontroller. There are so many companies offer uC, but I don't know which one has the most user-friendly software development tool. My application is relatively simple, so 8-bit...
Op-amp supply like to see low impedance voltage source. You can do that by adding one or more capacitor to pin-8 of the op-amp. You can use 0.1uF in parallel with another 10uF capacitor. If the op-amp output load is very larger, there will be voltage drop accross the 150 ohm resistor which...
If you want to build it youself, I recommend you to build a constant-voltge electronic load. It is very similar to a shunt voltage regulator. I quickly Google a few webpages:
**broken link removed**
**broken link removed**
The easiest way is to buy an electronic load that has a...
Hi Sabu,
What you need is a two-quadrant (or four-quadrant) power supply. You characterize your solar panel by sweeping the four-quadrant power supply voltage and measure the solar panel current. This is the solar IV curve.
You can measure LDO PSRR using a network analyzer and a power amplifier. An oscilloscope with a function generator and amplifier might also work as described in the article.
I was very surprise by the announcement last week about the TI-National acquisition. What do you think about the TI-National acquisition? Who are the winners and loser?
Hi myasir786, Can you tell me about your battery? What kind of battery are you trying to charge? Charging lithium ion battery is different for nickel metal hydrid (NiMH) battery, different from nickel cadmium (NiCd) battery, different from lead-acid battery.
How many cells are trying to...
Hi Fostachild, It is hard to find op-amp that can drive 500mA. You can try Cirrus Logic's power amplifier. If you need to use it as an instrument for testing purpose, you can try this laboratory power amplifier.
Hi Syncopator, I checked this article How to charge Nickel Metal Hydride Batteries. about trickle charge. Because the charger is voltage limited, as the battery voltage approaches 13.5V, the current approaches zero. So it is safe to maintained top-off charge indefinitely.
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