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G8MNY > TECH 08.08.20 08:56l 38 Lines 960 Bytes #999 (0) @ WW
BID : 624_GB7CIP
Read: DJ6UX GUEST OE7FMI
Subj: Flashing LED lamp driver
Path: DB0FHN<DB0RBS<DB0ERF<OK0NAG<F3KT<F1OYP<KE0GB<N7HPX<KF5JRV<N3HYM<
GB7CIP
Sent: 200808/0753Z @:GB7CIP.#32.GBR.EURO #:624 [Caterham Surrey GBR] $:624_GB7C
From: G8MNY@GB7CIP.#32.GBR.EURO
To : TECH@WW
By G8MNY (New Jan 14)
(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)
Here is a small circuit I used to flash an existing panel lamp on a broadcast
mixing desk.
Flashing LED ÚÄÄÄÄÄÄÂÄÄ22RÄÄÄ+15V
/// ³/e ³ *
Earth to >ÄÄ2k2Ä´>ÃÄÄ´ PNP +³
flash Lamp ³\ === 1000uF
³ ³ *
15V 30mA ³
Lamp ³
³ ³
ÄÄÄÁÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄ0V
* Optional components to remove pulses from supply rail
HOW IT WORKS
The flashimg LED draws only small current until it lights. When on the PNP is
driven hard to give power to the panel lamp.
This a much simpler solution than an Astable/555 timer/Pic etc.
See Tech bul "Towing & Reversing Beeper"
Why Don't U send an interesting bul?
73 De John, G8MNY @ GB7CIP
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