EEVblog

Mailbag Monday Coin Validator & Laser Scanner Teardowns Datasheets SCX6206 1980’s Microchip/GI EEPROM Chopper Amplifiers Forum HERE

No Script, No Fear, All Opinion

Dave reviews the Canon HF G10 Camcorder and compares it with his HF G10 for his blogging purposes. This is practically an identical video camera to the XA20 and X25 models. Extended video is HERE Forum HERE

What’s inside a 1964 vintage Power Design 2005 Precision Power Supply? Schematic HERE Forum HERE

Mailbag Monday Dave opens his mail, outback Australian style… Franky’s Ebay Store Ten Essential Skills for Electrical Engineers WiFi Digital Radio teardown 1970 vintage Magnetic Core Memory! Forum HERE

Dave upgrades his HP/Agilent 53131A frequency counter with an ovenised oscillator module from ebay. http://www.ebay.com.au/itm/121330209846 http://www.thinksrs.com/downloads/PDFs/Catalog/PRS10c.pdf http://www.2917.com/EBAY-images/NOX012166/STP2145A.pdf http://cp.literature.agilent.com/litweb/pdf/5967-6039EN.pdf Forum HERE

Did you know you can use your frequency counter to detect gravity? You’ve likely done it before and you didn’t even know it! Dave demonstrates the phenomenon of 2g-tipover on quartz crystal oscillators in an Agilent 53131A frequency counter. Related videos: How a rubidium frequency standard works FE-5680A Rubidium Standard Teardown Forum HERE

Dave looks inside the most popular microcomputer of the 1970’s, the Radio Shack / Tandy TRS-80 Model I And also a look at the TRS-80 Model 102. Bonus EMI testing for fun. Bonus rant on how slow the Tektronix MDO3000 is in RF mode. TMS4116 16Kb DRAM Level II BASIC Reference Manual Forum HERE Hi-Res Teardown Photos:

No Script, No Fear, All Opinion

Dave shows some techniques on how to build and mount usable PCB based front panels user interfaces with LCD displays and push buttons and capacitive touch buttons onto small cheap extruded aluminium enclosures. In particular for the µSupply project. This is Part 14 of that series. The uCalc project gets another look in, and does the Sharp Memory dot matrix LCD. Forum HERE

Mailbag Monday Spoilers: Dual voltage source selection circuit Casio FX-7000G the world’s first graphing scientific calculator, circa 1985. A 1989 vintage analog ohmeter. Teardown of a 450W electronic dimming module. Forum HERE

Dave troubleshoots a Soniq L32V12A 32″ HD LCD TV Forum HERE

Part 7 of Microphone Technology with Doug Ford, former head designer at Rode Microphones. This video Doug takes you through the design of the Rode NT3 and NT1000 microphone designs. There is a ton of stuff in here: Closed loop unity gain JFET and bipolar follow circuits. Bootstrapping out miller capacitance. JFET biasing. How to eliminate expensive high value resistors. How to add a bridged-T network to add marketing “pizazz” to a microphone. How to stop oscillation in closed loop systems. How to test and design closed loop systems for stability. Dominate pole compensation. Traps for young players in power amplifier stability. How circuits with capacitive loads oscillate. Emitter degeneration. Parasitic inductances and their effects. How to design a low noise and ultra high dynamic range valve based microphone preamplifier. Microphone power supplies. And how to design an amplified zener current source. All other videos in this series are HERE Forum HERE

What’s inside a 1975 vintage Tektronix 213 portable oscilloscope/DMM combo? Warranty VOID if NOT Removed T-Shirt Forum HERE Spec sheet Brochure Datasheets: Trigger Chip Decade Counter Chip High Res photos:

What booty awaits another night time dumpster dive raid on the garbage room? Dave scores a HP Laserjet 3700 colour printer and an ASUS P7P55D-E LX USB 3.0 motherboard with Intel i7-870 processor.