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2 Transistor 2
LED Flasher - Schematic only, there is no circuit description….
[Tony van Roon's circuit] |
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2 Transistor LED Flasher - This is a classic 2 transistor
astable multivibrator. Many other NPN small signal or switching
transistors can be used, including 2N4401, PN2222 or 2N2222 using the
circuit on the left. The circuit can also be inverted using PNP
transistors…. [from Bill's Electronics Reference Library] |
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2 Transistor LED Flasher (Bill Bowden) - This circuit will flash
a bright LED (500 mcd) as an attention getting device or fack car alarm.
Component values are not cirtical and other transistors may be….....
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2 Wire Lamp Flasher - Ideal to operate3 to24 Volt DC existing
on-Circuit lamps LED operation is also possible..... |
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200W Lamp Flasher - …..... [Site is under construction right
now] |
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220 Volt Flashing Lamps - This circuit is intended as a reliable
replacement to thermally-activated switches used for Christmas tree
lamp-flashing. The device formed by Q1, Q2 and related resistors triggers
the SCR. Timing is provided by R1,R2 & C1. To change flashing frequency
don't modify R1 and R2 values: set C1 value from 100 to 2200µF
instead.…..... |
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220 Volts Flashing Lamps - Especially designed for Christmas tree lamps.
Replaces old thermally-activated switches. (electronic circuit added 06/07/08)
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230V Rotating & Blinking LED - This design can be of some interest for those
wanting striking light signs, as it can drive up to three 230V lamp strings in three
operating modes. The 15V dc supply is obtained from a nominal 230/24V center tapped ac
transformer (T1) and a full wave rectifier.....(electronic design added 09/08)
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25 Light Sequencer using Xmas Lamps - This circuit above can drive 25 small
Xmas lights. The lights operate at about 200mA and 3 volts. The supply voltage is set
to 5 volts and the 4017 counter output will drop about a volt using the 2N3053
transistors. The voltage on the emitters of the rows transistors will be about 0.7
volts less than the base so the lamp voltage will be about 3 volts. You can..... [Bill
Bowden] |
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250ksps 16-Bit Micropower ADC offers an Excellent Combination of Size Power & Speed
- DN294 Design Notes (Linear Technology) (app note added 6/06)
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2-wire Lamp Flasher - This circuit has been designed to provide that
continuous light lamps already wired into a circuit, become flashing. Simply insert
circuit between existing lamp and negative supply. Especially suited for car or panel
pilot lights, this device can drive lamps up to 10W(design added 11/06) |
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