Flemming Jensen (10)

1-01-2014 | This cheap & cheerful circuit is indispensable if you are suspicious about a defective RJ45 cable in the patch cabinet or anywhere else for...

1-09-2005 | The two most important properties of a capacitor are its capacitance and its internal resistance (ESR). You need to know both values in orde...

1-07-2005 | Many ‘busy’ indicators for use in telephone systems present undesirable loading of the telephone line. Some circuits are very simple indeed...

1-12-2004 | This audio peak detector allows a pair of stereo channels to be monitored on a single LED.Identical circuitry is used in the left and right...

1-07-2004 | Electronics textbooks will tell you that a non-inverting opamp normally cannot be regulated down to 0 dB gain. If zero output is needed then...

1-02-2003 | Most commercial digital Capacitance meters can measure capacitors from a few pFs (picofarads) up to 2,000 µF (microfarads). A few are able t...

1-09-2002 | How about an in-circuit capacitor tester to take the strain out of tracking down faulty capacitors? No need to solder out any capacitor, sim...

1-12-2001 | The circuit diagram shows a low-cost, fast responding, peak holding, audio level indicator.The sensitivity is determined by preset P1, which...

1-12-2001 | When experimenting with opamp circuits, a dual supply is often needed. The circuit here presents a simple add-on that turns an ordinary benc...

1-07-2001 | Nearly always when a remote control doesn’t work, the underlying problem is elementary: the unit does not emit light. The cause may be dry s...