Power Flasher | Electronic Project Circuits

Posts Tagged ‘Power Flasher’

AC Load Line Power Flasher by SCR

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.
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 ripple from the bridge sufficiently for the transistor flasher circuitry to work properly but when the SCR turns on, the capacitor immediately discharges and will not provide enough current to keep the SCR on.

AC Load Line Power Flasher by SCR

Read more original source: http://www.techlib.com/electronics/powerflashers.htm

Be the first to comment - What do you think? Posted by admin - June 24, 2008 at 3:03 pm

Categories: LED Flasher, Lighting Tags: AC dimmer, lamp flasher, Power Flasher

Power Flasher with MOSFET

Suitable for alerting purposes Drives 12V Car bulbs
Derived from the Two-wire Lamp Flasher design, hosted on RED Free Circuit Designs since 1999, this astonishingly simple circuit allows one or two powerful 12V 21W car bulbs to be driven in flashing mode by means of a power MosFet.
Devices of this kind are particularly suited for road, traffic and yard alerts and in all cases where mains supply is not available but a powerful flashing light is yet necessary.
Notes:

* Flashing frequency can be varied within a limited range by changing C1 value.
* As high dc currents are involved, please use suitably sized cables for battery and bulb(s) connections.

Power Flasher with MOSFET

Parts:
R1______________6K8 1/4W Resistor
R2____________220K 1/4W Resistor
R3_____________22K 1/4W Resistor
C1____________100µF 25V Electrolytic Capacitor
C2_____________10µF 25V Electrolytic Capacitor
D1___________1N4002 100V 1A Diode
Q1____________BC557 45V 100mA PNP Transistor
Q2___________IRF530 100V 14A N-Channel Hexfet
LP1___________One 12V 21W Car Filament Bulb or two wired in parallel (See Notes)
SW1___________SPST Switch (3 Amp minimum)

Read More More Source: http://www.redcircuits.com//Page113.htm
Thank you.