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• HONEYBEE COUNTER
  I designed a circuit similar to this one a long time ago to help a beekeeper count the number of bees going into or out of a hive. The low power circuit uses a slotted opto-sensor to detect the passing bees. The circuit advances an electronic counting module whenever a honeybee passes through the sensor. The device only counts the number of bees going through the sensor. A different circuit would be needed to count the number of bees only going out or only coming into the hive.

• LONG PERIOD COMPUTER WATCH DOG TIMER
  This circuit uses a simple 4060 IC oscillator/timer which is reset periodically by a computer. Should the computer fail to send a pulse, the output changes state. The time can easily be set from seconds to hours.

How to read a supeR10 trace:  AN1979 The purpose of This AppNote is to give to the user all the keys to read and interpret the information shown in a Super10 Bondout trace and especially the timestamps....AN1979 -AN1979 -AN1979 - APPLICATION... (app note added 6/06)

HV430 105 Volt RMS Ring Generator:  Supertex Semiconductors  (app note added 2/06)

IEC Compliant Active-Energy Meter Design using the MCP3905/6:  Microchip Application Note - Published 27-Jul-05   (app note added 6/06)

IEC Compliant Active-Energy Meter Design using the MCP3905/6(Chinese):  Microchip Application Note - Published 17-Oct-05   (app note added 6/06)

Improved ESD immunity against interrupTS lock-up:  A whole set of extremely efficient protection guidelines are already described in the other AN1015. An additional software hardening technique will be described here to improve sotware robustness even further, when many interrupts are running concurrently and, if... (app note added 6/06)

Improved Kelvin contacts boost Current sensing accuracy by an order of magnitude:  02/17/05 EDN Design Ideas  / (added 5/05)  Many power-supply designs rely on accurately sensing the voltage across a current-sense element. Multiphase regulators use the sense voltage to force current sharing among phases, and single-phase regulators to control the current-limit setpoint. As internal complexity and clock speeds increase, processors impose narrower operating margins for power-supply voltages and currents, which in turn m...

Improved two-tone, third order testing:  Application Note - MiniCircuits.com  (app note added 6/06)

In Circuit Electrolytic Tester:  (electronic (schematic / circuit added 4/02)

Indicator features expanded scale:  02/21/02 EDN Design Ideas  /  (added 1/05)  Test equipment for a production line should be user-friendly (read "idiot-proof") and should offer minimal test time. In many cases, the test fixture must give an operator only one answer: pass or fail. Usually, two indicators assume this role: green for pass and red for fail. In most applications, a sensor transforms the tested parameter to a voltage; the test fixture must measure this v... ...

Infrared Remote Control Tester #1:  measures the relative intensities of different Infrared light sources (added 5/02)

Infrared Remote Control Tester:  (electronic Circuit / Schematic added 10/04)

Integrator Forms Picoammeter:  07/17/97 EDN-Design Ideas  / (added 3/03)   

Introduction to Time, Frequency and Modal Domains (5988-6765EN):  Aligent Application Note 1405-1 (added 4/08)

Invisible Broken Wire Detector:  Circuit / schematic (added 02/05)

IR Remote Control Tester:  (circuit / schematic design added 6/06)