Kenwood L-1000T , 1990

[baron]

Baron Inscribed thus:

Baron Inscribed thus:


Just and update: I got the marked value wrong, its 2.2F @ 5v. There
is
no indication of the manufacturer. I've currently got a 4.5v 60ma
torch bulb connected across it to discharge it. It took a few seconds
for the bulb to stop glowing. Anyway I'm going to leave it overnight
and check its ESR tomorrow. It should be well and truly discharged by
then.

Following up: The ESR measures 10-11 ohms (last digit can't make up its
mind). Peak charge current from a 5v 0.5ohm source hits 480ma (AVO 8
on 1A range) before rapidly dropping to zero. Four hours later the
terminal voltage is still 5V (Advance 10Mopv meter).

 

[baron]

N_Cook Inscribed thus:

I discharged overnight an NEC U6 265 green, 0.2F, 5.5V and got an ESR
of 5.6R

That's about half of the value I measured.

 

[David]

"baron" wrote in message

Baron Inscribed thus:

Baron Inscribed thus:


Just and update: I got the marked value wrong, its 2.2F @ 5v.
There
is
no indication of the manufacturer. I've currently got a 4.5v
60ma
torch bulb connected across it to discharge it. It took a few
seconds
for the bulb to stop glowing. Anyway I'm going to leave it
overnight
and check its ESR tomorrow. It should be well and truly
discharged by
then.

Following up: The ESR measures 10-11 ohms (last digit can't
make up its
mnd). Peak charge current from a 5v 0.5ohm source hits 480ma
(AVO 8
on 1A range) before rapidly dropping to zero. Four hours later
the
terminal voltage is still 5V (Advance 10Mopv meter).

You have a good one with 10 ohms. The 10 - 15 year old ones had
much higher ESR even when new but still low leakage.

David

 

[baron]

David Inscribed thus:

"baron" wrote in message

Baron Inscribed thus:



You have a good one with 10 ohms. The 10 - 15 year old ones had
much higher ESR even when new but still low leakage.

David

Wow ! Thanks.
Apart from playing with it yesterday, its sat on my bench for weeks
looking for something to do...