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74xx contest entry: 4-bit SAR ADC

74xx contest entry: 4-bit SAR ADC

0

This is my project for the 74xx contest. It’s a 4-bit SAR ADC.

An ADC, which stands for Analog to Digital Converter, is a circuit that converts an analog value into a digital representation in binary form. Each bit of the result has a weight. The 0th bit is the LSB and its weight is Vref/2^N where Vref …..

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555 contest entry: capacitance meter

555 contest entry: capacitance meter

2

The output frequency of a 555 timer in the astable configuration is dependent on the capacitance, and resistorsĀ as well. Knowing the resistances and measuring the output frequency, we can get the capacitance.

In the classical astable configuration shown below:

the frequency is given by:

I preferred instead the configuration with a 50% duty cycle, for a better output measurement:

and the …..

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NE555 Contest Entry: 2bits full adder (and subtractor)

NE555 Contest Entry: 2bits full adder (and subtractor)

2

The project is a 2bits full adder using only NE555 ICs, some resistors and a bunch of bjts.

The idea is to use the 555 as an inverter by putting the threshold pin to Vdd and using the trigger pin as input. Doing so you get the inverted input at the output pin but XORs and NANDs need …..

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