Shaker 100

Special designed for the Mustang S197 stock amplifier replacement. A 100 Watt RMS single channel amplifier.



A mirror reflects the sun into my living room as daylight lamp.


Propellor clock

Eight leds on a string powered with a VCR head motor.


Powerled Domotica

Domotica system RGB, warm white power leds and curtain controller.


The propellor led clock

8 fast spinning high bright led's 

A propeller clock is a fast rotating array of 7 high bright leds. After triggering the hall sensor it builds a virtual picture. The software is measuring the time of the rotations to justify the width. The power for the circuit board and the leds is inductive transferred by one of the video head coils. A infra red led transfers the DCF signal to the pcb.
The LED's are rotating at 1500rpm. The motor is an VCR head from a Sharp VC651SH it's supplied with 12V 410mA
The 1288 rpm (21Hz) is just enough for a stable picture.
propclock covered

The pie cover is to reduce the wind noise and to increase the rotation speed it goes to 1520 rpm.(12V 350mA)The noise is so much at >1000 rpm it's not usable for permanent. With the motor on 16V 460mA the speed is 1812 rpm
propclock motor

On the right side of the motor is a round magnet to trigger the hall sensor TLC4905.
The experimental PCB is the pulse generator for the inductive power supply. It runs at 4V 170mA (0.68W) and 20KHhz. The components are a HEF4093 and a BUZ11
The total system needs motor: 6W and electronics: 0.68W
propclock leds

The high bright red leds.
propclock pcb

Details of the clock. Some modification on the PCB to make it work. The 1F capacitor and ICP (In Circuit Programming) connector are on the underside. The capacitor is used for the PCF8583 I2C clock to keep it running for a few days. The time is synchronized with a DFC receiver via by infrared communication. DCF is a German transmitter on 77Khz and every second a 100 or 200mS pulse is transmitted. The data can be decoded into time and date, my software decodes only the time. It's also possible to set the clock via the ICP connector to make a RS232 connection to the PC and HyperTerminal.

Hardware and software 

The software is written in C the processor is a microchip 16F628. The Timer1 is used to measure the rotation speed. When no rotation the timer overflows and the IRQ reads the serial port.
After the hall trigger the HH:MM:SS are written to the LED's. Digits are 7*5 array's. Next read the I2C time and convert to digits.