blueroomelectronics
Well-Known Member
The 1N4148 has a 200ma version. Would this be enough for use as a flyback diode on a 5v 80ma relay? What is the general rule of thumb reguarding flyback diode ratings?
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The 1N4148 has a 200ma version. Would this be enough for use as a flyback diode on a 5v 80ma relay? What is the general rule of thumb reguarding flyback diode ratings?
The 1N4148 has a 200ma version. Would this be enough for use as a flyback diode on a 5v 80ma relay? What is the general rule of thumb reguarding flyback diode ratings?
Thank you all, now I've only got to figure out how to drive a small Omron 5V / 30mA G5V-1 relay from a 3.3V @ 2mA source (an 18F PIC with only 2mA source / sink I/O)
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A 2N2222A with 2.2K base resistor might do the trick.
Well 3.3V relays are scarce compared to the common 5V ones. I would figure it'll work fine with 5V or 12V for that matter.
Where can I find the 2N equivalent of the BC109B?
The supply will be unregulated for the relays although 5V 1.5A SMS wall warts are cheap these days.
LOL Google got me nothing but vendors.
The 2N2222A came up. Always a favorite.
Thanks Eric, wonder why a 5.1 Zener is used as a flyback?
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Instead of 1N4148, better to prefer FR series diodes or BA15xseries.
I fear that Initial surge even before the current starts flowing, might damage 1N4148.