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Design Ideas

Power supply meets automotive-transient-voltage specs 9/18/2008

An automotive power supply meets the transient-voltage specs of ISO 7637-1.

Hot-swap circuit allows two computers to monitor an RS-232 channel 5/29/2008

A hot-swap serial-interface circuit allows two computers to monitor all the traffic on an RS-232 port.

Bit-shifting method performs fast integer multiplying by fractions in C 5/29/2008

Instead of calling math-library functions, you can multiply integers using bit shifting.

Capacitive touch switch uses CPLD 5/29/2008

Using an Altera MAX IIZ CPLD, you can implement a touch-switch decoder with no external components.

Dual flip-flop forms simple delayed-pulse generator 4/17/2008

A delayed pulse generator provides precision timing adjustments.

Transmission lines simulate digital filters in PSpice 4/17/2008

You can simulate digital filters in PSpice by using transmission lines as delay elements.

Analog voltage controls digital potentiometer 3/20/2008

A microcontroller with an internal ADC controls a digital potentiometer via an I2C interface.

Automotive switching regulators get input-transient-voltage protection 1/24/2008

A simple scheme protects switching regulators against 50V voltage transients in automotive applications.

Use the MCLR pin as an output with PIC microcontrollers 1/10/2008

Adding a MOSFET to a 6-pin microcontroller transforms its reset/programming pin into an output pin.

Cascade two decade counters to obtain 19-step sequential counter 12/14/2007

Interleaving the outputs of a pair of Johnson counters yields a 19-step, sequential count.
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