EEVblog

No Script, No Fear, All Opinion

Dave plays around with an energy harvesting kit to see how much power he can get out of a Peltier device used as a Seeback effect module to generate power from temperature differentials. Bonus white board tutorial on how Peltier devices work as heat pumps. Wuerth Elektronik Energy Harvesting Kit Linear Technology Product Page DC2080A Demo Manual LTC3108 Energy harvesting chip datasheet VIDEO Measuring microcontroller sleep current using integration on an oscilloscope Forum HERE

Teardown Tuesday Inside a 1973 vintage programmable scientific desktop calculator. The P2102 is a 1K x 1 bit SRAM, so looks like a 4 bit processor architecture. Forum: http://www.eevblog.com/forum/blog/eevblog-663-compucorp-322g-calculator-teardown/ Teardown photos:

In this tutorial Dave demonstrates the seldom used and often little understood mathematical integration function available on your modern digital oscilloscope. And demonstrates a practical example use for it in accurately measuring the total power consumption of a microcontroller that sleeps and then wakes up and does some processing before shutting down again. By getting the total area under the current curve. Forum HERE

Mailbag Monday Negative Feedback T-Shirts NOTE: Black shirt coming shortly, bug in Teespring site… 555 Timer T-Shirt Warranty VOID T-Shirt Spoliers & Links: Programmable Constant Current Dummy Load Geppetto Electronics SMD Prototype Board The RoBoard Robot Development Board LED Strip Driver Board Madworm projects on Tindie Conrad Retro Radio Kits Evoke Flow WIFi Radio OLED Display Repair MiniDSO Pocket Oscilloscope (a.k.a Seed Studio DSO Quad) Pi Power Raspberry Pit power adapter L293D H-Bridge Motor driver chip MOSFET MCP1804 LDO Silicate rock used in solar cell manufacture Forum HERE

No Script, No Fear, All Opinion

Some experiments with the Electrocardiogram (ECG) circuitry in the St Jude Pacemaker Monitor Heart Rate Analyser. Forum HERE

What’s inside an IEC60601-1 medical class 5V mains DC-DC plugpack? What is the difference between PCB clearance and creepage? A German FRIWO 5V FW7555M/05 brand medical grade isolation unit vs a cheap Wun Hung Lo consumer brand. Also a comparative look at transformer construction. Datasheets & Links: www.farnell.com/datasheets/30889.pdf IEC_60601 Rubycon Caps CD 263 Caps. Vishay Optocouplers Forum HERE

Mailbag Monday. Dave opens his mail Forum HERE Spoilers: Keithley 177 Multimeter teardown schmeatic and Manual Commodore GL987R Calculator Teardown and VFD probing. Sharpie Hanger Kickstarter

Some interviews from the 2014 Sydney Mini Maker Faire at the powerhouse museum.

What’s inside a dial-in pacemaker monitor system? Datasheets: LMV824 MAX4330 CNY64 Optocoupler ADSP-2185N DSP CX88168 Smart Modem with Voice CODEC MAX994 10bit ADC Meder Reed Sensor Probe shock video showing the piezoelectric effect Forum HERE

Lots of test equipment auction goodness from Precision Mechatronics who went into liquidation. And is it possible to mod a system PSU with binding posts? Service manual HERE Keithley 2400 SMU Source Unit Agilent 54845A 1.5GHz Infiniium Oscilloscope Agilent E3646A dual output bench power supply Agilent 6641A and 6643A DC system power supplies. HP 3488A GPIB Matrix Switch

Behind the scenes at the 2014 Sydney Mini Maker Faire at the Powerhouse Museum.

Highlights from the 2014 Sydney Mini Maker Faire Introduction Video Behind The Scenes Video Growing Maker Communities Video

Dave explains a big trap in high frequency measurement with your oscilloscope. Based on a viewer request, Dave demonstrates how to incorrectly and then correctly measure the signal output level over frequency of your function generator using your oscilloscope. Some whiteboard transmission line theory is thrown in as well. Forum HERE