Teardowns

Here is teardown of one ADSL modem and WLAN base station Aging capacitor here? →

I had some broked LED flashlights and I thought of using components from them. Especially the compact battery holder that takes three AAA batteries looks useful in other small projects. Those worked OK when lightly loaded. But when I started taking current for a small motor, I could not get acceptable power out of them. →

I have earlier written about bad cheap Chinese wire connect that did not live up to specifications and was potentially dangerous for mains power at http://www.epanorama.net/newepa/2018/01/24/cheap-quick-wire-connector-block/ Here is teardown of that Let’s open open it Here was all. The problem in construction that there is quite weak spring that pushes against wire. On the other →

Here is few years old SilverCrest USB power pack with solar charger that stopper charging a smart phone. Because changing the charging cable did not help and the charging connector felt a little loose, it seems that the power pack is to blame here. Ithad served several years well as portable power pack that had →

Here is a tear-down of ST-OV2- 12DC/ 60DC/1 – 2905022 solid state relay from Phoenix Contact. This product is old, obsolete and manufacturing has been discontinued.   Solid-state relay ST-OV2- 12DC/ 60DC/1 – 2905022 is a plug-in power solid-state relay (plug to certain Phoenix Contact wiring terminals), with LED and protective circuit in input and →

Here is teardown of a ALADDIN HASP software copy protection module that was designed to be plugged to PC parallel port. Because modern PCs no longer have parallel ports, this is obsolete technology ready for teardown. Not much to be, just few custom or custom marked ICs (ALHY1 and SPIN1) inside. →

Here is tear-down of PT 2X2-24DC-ST over voltage protector for 24V systems: PT protective connector with protective circuit for two 2-wire floating signal circuits. 24 V DC nominal voltage. HART-compatible. What is insideComponents close-upWhat was found was two dual gas discharge tubes ant two other over voltage protectors. The gas discharge tubes were connected to →

Here is a collection of interesting videos on microphones and microphone technologies: Audio 101: Microphones Dynamic vs Condenser Microphones, What’s the Difference? Audio recording tutorial: The different microphone types | lynda.com XLR vs USB Microphones, Which Should You Buy? $22 MICROPHONE VS $3600 MICROPHONE | Andrew Huang Voice-over Microphone || DIY or Buy How a →

Android smartphones and PC use TRRS headset connectors. You can find details on that interface on my Telephone handset to smart phone and laptop posting. Ealier PCs used two TRS plugs (mic and headphones) for headsets. Because both connection types are still in use, sometimes adapters are needed. Here are some details of those adapters. →

I did earlier a teardown of broken Behringer B208D active PA speaker. Now it was time to get ot fixed. The problem was that sound level before distortion was very low and bass was missing. It seems that low frequency driver could output only 1-2V signal to speaker before distortion, and to get that the →