Electronics Forum / Electronics / June 2004

G'day folks, I originally asked about this problem in s.e.repairs,
completely forgot about a.electronics at the time.
I've got a IBM P70 with reduced width, all voltages seem to measure OK,
(I've got the Sony 17SE2T Service Manual), replaced one transformer with

I need a flameproof resistor of 1.2k ohms but I only have one of 1k
and one of 200 ohms.(both flameproof)
Now theoretically speaking, connecting them in series the total
resistance would be 1.2k ohms but would the safety factor of a

I've built a nice little 78S40 regualtor which works fine, my first
questions is this seems to be a old IC according to some websites, though if
this is the case, whats the new versions number ?  Can't even find it on
Motorolas site....

I have an AKAI CT-2579a tv with bad flareing of red and blue accross the
screen .
I dont have a service manual.
does anybody know about this fault on this AKAI model,

im looking for 13mm coil formers suitable for the sc480 power amplifier.
Anybody know where these are available?. THANKS

We need an Inventor/Engineer who has the ability to recreate in a new simple
system the 7800 console!
O'Shea, Ltd. is located in Kansas City, MO since 1975. We own 1 million
Atari game cartridges from the late 70's. Many of you know that the Atari

Folks,
I am a beginning electronics student and am having trouble figuring out just
how to connect a bode plotter to a simple transformer circuit to measure
magnitude vs. freq.  Can anyone give me some general guidelines for

I am a Newbie to news groups so I apologise in advance for any
transgressions in Nettiquette!
I have recently completed rebuilding a 45 years old small motorcycle,
as a project, and would like to improve the lighting/charging system.

I read somewhere that you can prolong Battery Life by leaving the lid off of
devices, so heat can escape. Is this true and how much can they be prolonged if
so?

Does anyone have information for the TDA7243 ?
I dont know what it is.
Thanks in advance.
Regards.

Wij hebben een probleem met een diesel generator "Lister-Petter".
Het generator gedeelte wat 220V bij 7000KVA moet kunnen leveren leverd nu
maar rond de 150V.
Kan ons hier iemand mee helpen?

I very much like the circuit by Israel Schleicher in EDN Jun 12 2003 for its
ability to drive a 3.6 volt Superbright LED off a 1.2 to 1.5 volt cell with
very minimal and inexpensive components. Since it pulses the LED, greater
perceived brightness can be acheived at great efficiency ...

Does anyone have information for the TDA7243 ?
I dont know what it is.
Thanks in advance.
Regards.

Need help to buy a large TV
******************************
My friend is looking to buy a 42 to 60 inch TV
She does not want to pay over $1,000.

I have a AA Nicad charger that charges 700mAh batteries using the 5hr rate, but
I want to use 1000mAh batteries (same size, AA Nicad). Is it ok to recharge
them using that, and is the charging time also 5hr or should it be longer?
Thanks.