Electro Bob

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Category: Projects

21 Comments

Digital Power Supply – Part 1: Concept

By electrobob March 17, 2011 February 8, 2017 Ideas and Articles, Projects

Started working on a digitally controllable power supply. Continue reading

Tagged analog, comparator, digital, loop, microcontroller, power, regulator, smps, supply, transformer, transistor, xmega, xmega32a4

18 Comments

555 class D amplifier

By electrobob February 28, 2011 February 8, 2017 Projects

Building a 555 based class D amplifier, even building the 555. Continue reading

Tagged 4013, 4093, 555, 555contest.com, amplifier, audio, class d, driver, gate, high, lm319, mos, mosfet, outpu, power, pull, push, transistor

14 Comments

Secret knock detector with 555

By electrobob February 28, 2011 February 8, 2017 Projects

Detecting a secret knock pattern using 555’s. Continue reading

Tagged 555, 555contest.com, breadboard, circuit, detector, door, entry, knoc, led, microphone, relay, reset, secret, timer, transistor

9 Comments

555 / 556 H bridge

By electrobob February 22, 2011 February 8, 2017 Ideas and Articles, Projects

Simple H-bridge using 555’s. Continue reading

Tagged 555, 555contest.com, 556, bridge, cheap, contest, diode, h-bridge, hbridge, low, microcontroller, motor, power, pwm, simple, timer, zener

35 Comments

EGO BOX

By electrobob January 15, 2011 February 8, 2017 Projects

A physical display that connects to the internet to display the visits counter on my website. Continue reading

Tagged 7, access, box, count, counter, display, ego, enc28j60, ethernet, hits, internet, php, physical, script, segment, seven, stack, tcp/ip, view, visits, wordpress

42 Comments

LED UV exposure box part 2, the timer

By electrobob September 29, 2010 February 8, 2017 Projects

Buiding a timer for a PCB UV exposure box. Continue reading

Tagged 7 segment, attiny2313, box, button, countdown, exposure, led, timer, UV

48 Comments

LED UV exposure box part 1, the box

By electrobob June 24, 2010 February 8, 2017 Projects

Building a nice UV exposure box to make PCBs. Continue reading

Tagged box, exposure, led, leds, LM317, pcb, plexi, timer, UV, uv leds

16 Comments

CoMBi Clock

By electrobob June 5, 2010 February 8, 2017 Projects

A binary clock that displays hours minutes and seconds using colors on LEDs. Super difficult to read! Continue reading

Tagged binary, clock, digital, DS3232, led, microcontroller, multiplex, RGB, RTC

44 Comments

Sunrise simulator

By electrobob April 7, 2010 February 8, 2017 Projects

A DIY sunrise simulator using a high power light, for a soft wake up during the winter time. Continue reading

Tagged alarm, circuit, clock, dimmer, dusk, light, microcontroller, radio, schematic, sunrise, sunrise simulator, triac

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