Arduino Punk Console

A programmable 8 step tone sequencer using an Arduino microcontroller. Features a 2 line x 16 character backlit LCD display..

Control the speed of a DC motor with a potentiometer with an Arduino board

A quick circuit showing how to control the speed of a DC motor with a potentiometer with your Arduino board. Also shows how to use a TIP120 transistor to allow the Arduino control a larger power supply...

Arduino Guitar Delay Pedal

An attempt at an Arduino guitar pedal. The guitar signal feeds through a PT2399 delay circuit, modified to include a JFET preamp phase. The delay circuit has Echo and Delay knobs. From there, it feeds into an optoisolated-Arduino-5V preamp, and out to the Arduino. The output from the Arduino is filtered and sent to the amp...

This circuit drives a high brightness LED as a strobe/flasher. The BD136 (I had one spare) transistor can be used to drive an LED from a higher voltage source than the PIC operates from if required. A BC546/7/ 8 would also do the job but ensure that the LED current limiting resistor keeps the Collector current below a 100mA absolute maximum rating..

The design features low cost, easy installation, no battery backup and no EMI. The AT89C2051 uses external oscillator generated by schmitt trigger gate CD4093, ~680kHz. Reference frequency was derived from 50Hz main line. Time setting only allows at 18:00 by pressing time set button once. If main line has failed, functioning LED will blink at high rate . Since there is no battery backup, thus repressing the button is then needed. The output is capable of driving say, a 25W incandescent lamp...

The circuit is a divider by 64 used in many RF applications like as satellite receiver, digital tuners, frequency counters, PLL, etc. The heart of circuit is an IC named SAB6456, but you can use SDA2101 or other equivalent chips. Each output is NOT of the other...

This circuit is useful to amplify and distribute video signals with low noise and without losses. The CA3100 is a fast opamp designed to amplify video signals. Set the P1 to control the input signal level to have a clear picture on the TV set...

The GT4123 and GT4123A are the first dedicated single device, two input video mixer ICs available to the professional video and multimedia markets. Each input signal is applied to a conventional differential amplifier (AMP A and AMP B). From the amplifiers, the signals are applied to analog multiplier circuits (XA and XB) whose outputs are the product of the input signals and internally generated controlling voltages VCA and VCB...

The 8x1 module uses a CMOS 74HC237 combination 3 to 8 decoder/latch for crosspoint selection, the 10x1 module uses a Motorola MC14028B BCD-to-decimal decoder...

The GX434 is a high performance low cost monolithic 4x1 video multiplexer incorporating four bipolar switches with a common output, a 2 to 4 address decoder and fast chip select circuitry. The chip select input allows for multi-chip paralleled operation in routing matrix applications. The chip is selected by applying a logic 0 on the chip select input...

This reflex radio project was inspired by Robert Bazian 's design. His reflex radio is the "darndest" thing I have seen and his spectacular results inspired me to come up with my own version! These designs are similar to two-transistor circuits used in some ancient Japanese "Boys Radios" except that the inter-stage transformer directly drives the speaker. The antenna coil is just 20 turns wrapped around four insulated posts as seen in the photos and shown in the diagram below. I used nylon posts but ordinary bolts covered with tubing would work fine. The dimensions are not particularly critical; those shown happen to fit inside the case I chose...