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Design Center
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 I
2
C 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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