Power Flashers


Posted on Feb 4, 2014

A simple circuit for sequentially flashing Christmas light strings or other similar low-power lamps. The socket symbols may be single bulbs or sockets for lamp strings. The load must be capable of operating from DC since the SCRs rectify the line voltage. The SCRs must be sensitive-gate types and must be able to handle the load current and


Power Flashers
Click here to download the full size of the above Circuit.

line voltage. The 1uF capacitors are non-polar film types. A fuse is indicated and a GFI type of outlet is recommended. Warning: This circuit should be constructed only by persons with the qualifications to work on and design high voltage circuitry. Necessary safety considerations are not indicated. All parts of the circuit should be considered "hot". The circuit may be extended by repeating the pattern with the last neon lamp connecting back to the first through a capacitor. Although a quick breadboard was tested, this circuit is "experimental" and may require some tweaking for best performance. The flashing speed may be controlled by connecting a 100k ohm (or larger) potentiometer across the 10 uF capacitor and connecting the 1 meg resistors to the wiper. Make sure that the shaft is an insulated type. The 1 meg resistors may be lowered in value for faster flashing. Here is an unusual flasher circuit for 120VAC loads. The circuit is similar to the two-transistor flasher seen in several circuits in techlib. com except that an SCR is used. Warning: This circuit should be constructed only by persons with the qualifications to work on and design high voltage circuitry. Necessary safety considerations are not indicated. All parts of the circuit should be considered "hot". A little circuit trick is hiding in the selection of the 0. 1uF capacitor in series with the 1k resistor. When the SCR is off, this capacitor smoothes the...




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Operational Amplifier tutorial
    ISP microcontroller PLC implement method
    AD8195 and DDC buffers
    Data logging with an EEPROM
    simple digital counter by
    24V lead acid battery charger circuit
    Discrete Robot
    43 dB antenna amplifier circuit diagram
    Water Level Detector With Alarm
    Compound excited DC motor reversing circuit



    Top