Teardowns

What is inside this old mains power filter? →

Why do cheap key feel so bad when typing. Let’s take a tear-down of one HP keyboard. Let’s open it Rubber makes the “keyboard bad feel”. I remenber rubber keyboard feel from Sinclair Spectrum (at 1983)… Flexible circuit board material is used for switches Circuit board Not much to see on the other side of →

Here is teardown of one cell phone repeater device →

http://cobhamwireless.com/product/900mhz/d-sbr-3009/axel-wireless-products-014-3/ Such a repeater has the following main features: Axell 3009D - 900 MHz Software Defined Repeater, 25 dBm composite output power, 82 dB Gain, 12 sub-bands, individual gain and ALC, bandwidth settable by software IP65 rated enclosure. Connectors Inside view →

I bought some years go SILVERCREST Li-lon Rechargeable Handheld Vacuum Cleaner. After those years it does not work properly anymore: it runs just few seconds even though fully charged and then did not start at all. I thought that maybe batteries were going bad. Time for tear-down: Gg Opening the device… Here is the elecronics. →

I have earlier posted DC to AC inverter teardown that showed wat was inside one cheap “modified sinewave” inverter. Now I do a tear-down to a more expensive “true sineware” inverter PI150S from Velleman. This inverter convers 12V DC to nice sinewave 230V 50Hz AC power  (up to 150W). View to front and back. This unit →

https://techcrunch.com/2017/04/24/juicero-may-be-the-absurd-avatar-of-silicon-valley-hubris-but-boy-is-it-well-engineered/?ncid=rss&utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+Techcrunch+%28TechCrunch%29&utm_content=FaceBook&sr_share=facebook Ben Einstein, general partner at Bolt, served up this excellent teardown of the Juicero on the company blog. If you were wondering how a juice press could possibly cost $400… well, this is how. →

This is 150W 12V DC to 230V 50 Hz AC conveter designed to be used in car. It failed few days ago when powering a laptop.  Let’s take a look what is inside. Closer look. Here is DC power input filtering.. looks as quite ugly late add-on to design.. More circuit board details. On the →

Recently, the media has been on discussion on making the country roads to be controlled by private company and Finnish cars envisaged the so-called mandatory. black box. On this discussion it has been several times mentioned that the Finnish Government has planned a mandatory monitoring devices for all cars to collect “road tax” based on →

Some time ago I built Avalanche pulse generator circuit. In that project I used a slightly odd car to “mains” adaptor device as the DC/DC converter to generate the voltage (around 100V) needed to power the avalanche circuit. Here is view of that part of Avalanche pulse generator circuit: I had bought that device that →