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G8MNY > TECH 16.05.14 12:03l 35 Lines 982 Bytes #999 (0) @ WW
BID : 63468_GB7CIP
Read: DK3UZ GUEST DG4IAK
Subj: Flashing LED lamp driver
Path: DB0FHN<DB0PM<OE2XZR<OE5XBR<OE1XAB<HG8LXL<CX2SA<IW8PGT<IZ3LSV<IK6ZDE<
VE3UIL<I0OJJ<GB7CIP
Sent: 140516/0819Z @:GB7CIP.#32.GBR.EU #:63468 [Caterham Surrey GBR] $:63468_GB
From: G8MNY@GB7CIP.#32.GBR.EU
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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