Engineering and Technology

Here is the video on youtube. You must watch it if you are a Urdu to Hindi viewer: Here is the video on youtube. You must watch it if you are an English viewer: The microwave oven is a useful machine to preheat or cook food. The microwave oven is working reliably but now a days Chinese microwave oven have big front panel keypad failure. The keypad is breaking down in one year of less time. The repair is not easy and sometimes the replacement parts are not readily available then it becomes another problem. The solution to such a problem is a modification with existing easily available parts and some wire connections to the main board. The modification is a very robust an reliable work so that will never break down or if breaks down, the repair would be way easy and low cost. Here is a little detail with images is included for such a modification work. Most of the images are from the video associated with this blog post. Anyhow it will further explain the important...

Here is the youtube video for such product review: The HT6872 is the world smallest audio amplifier which is a class D design. If you are looking for a small 1"x 1" stereo amplifier board, the HT6872 from ICStation.com is the best choice for you. Here is the product detail: Product Introduction: 1.Anti-clipping function  2.Excellent full bandwidth EMI suppression performance  3.Free of filter digital modulation,and it can directly drive loudspeakers 4.Output Power:1.40W (3.6V);2.82W (5.0V);4.71W (6.5V) 5.Good click-pop noise suppression performance  6.High Signal Noise Rate:87dB 7.Low Quiescent Current:2.64mA (3.6V);3.26mA (5.0V);4.04mA (6.5V) 8.Low Turn-off Current:0.01uA  9.Overcurrent protection and automatic recovery function  10.Overheat protection function  11. Under voltage exception protection function  You can off course use such product in numerous applications. The use is over your requirement....

• The 12/24V 3-Stage Solar Charge Controller is a genuine MPPT charge controller. The Mosfet is a switching type and is driven with a PWM signal. An inductor is used to convert the voltage and current for maximum power transfer from the solar panel. We do not make any commercial products. You can build the charger using available parts or a kit from Jaycar (Cat. KC5500, www.jaycar.com.au ). Note, that we published a revised version of this project in the February and March 2016 issues which provides a higher charging current and great er efficiency and a revised kit is also available.

Having been inconvenienced by a flat car battery at home more than once, I would love a simple low battery alarm that could be direct-connected to the battery terminals, that would let out an ear-piercing sound if the battery was discharged below a threshold voltage. Would you consider publishing a suitable circuit/kit that would activate a suitable relay? Now I don't know what voltage would be a safe threshold voltage to activate the alarm-perhaps between 10.5V and 11.5V? But I do know that having a time delay of approximately one minute would be necessary to prevent nuisance alarms because of starting the engine. (C. D., Auckland, NZ) • We published a couple of battery saver projects, one in July 2004 ("Versatile Micropower Battery Protector", by Peter Smith) and one in September 2013 ("LifeSaver for Lithium or SLA batteries", by Nicholas Vinen) but unfortunately, both work by disconnecting the load ...