Hi
Batteries self discharge simply sitting on the shelf. Most lead acid
spec sheets talk about this in terms or “percent per month” sort
of numbers. If your 200AH battery discharges 1% a month, that’s
right at a milliamp.
A modern silicon diode likely has leakage numbers in the nanoamp
range. A microamp would be pretty massive on a modern part. The
discharge from a couple diodes in a bridge is not going to have a
significant impact compared to a single isolation diode.
All we’re talking about here is that added isolation diode. The rest
is very much “up to the user”.
Bob
Not a good idea, Bob.
Some batteries, particularly lead-acid, see the pulsing DC as
charge-discharge cycles, shortening their lives. Diodes do not have infinite
reverse resistance; so, leaving a battery connected to a transformer + rectifier
combo will discharge the battery a bit faster than shelf life.
If you don’t use a battery or regulator to smooth out the
pulses, your outgoing radio signal will be modulated with 100 Hz or 120 Hz
noise.
73 de Brian, VK2GCE
From: Bob kb8tq
[mailto:[email protected]]
Sent: Tuesday, 6 September 2022 1:54 PM
To: Brian Clarke
Cc: Glenn Little WB4UIV; ARC-5
Subject: Re: [ARC5] 24vdc power
Hi
If this is a basic “no regulation” supply ( = transformer
driving diodes into a load +
(maybe) a cap …) the addition of a diode to isolate this or
that does nothing useful.