T&L Publications

Anyway the problem has been solved..
I used audio isolation transformer
on the output from the headphone jack..<p>Regds
Allan

I just tried using a 7809 regulator on
the LM380 side, same problem..<p>It is very hard to get rid of this noise..
In fact I tried other 12->5v LM317 based
stepdown transformers same problem..
Regds
Allan

Hi I just built a few different circuits using different amps: lm380 and Tba820M<p>the noise is dramatically less than the LM386...<p>Ok the Noise is a high frequency 'hum' When the PDA power supply (12v to 5 v) is disconnected, clean sound, no hum<p>if the PDA is switched off, no noise at all even ...

Hi Regarding my earlier post on fade in/out I decided to Kiv that for a while.. So I built a quick kit of an LM 386 amp and I had the following problem<p>Power Source= Cigaratte lighter LM386 board is powered direct from 12++ volts in the car. Power is smoothed using a 1000UF and a 10UF capacitor<p>...

Hi I need some help on the following:<p>I have installed a PDA and a garmin GPS in my car and the Oziexplorer CE software I have, allows me to execute a voice file when I am near the proximity of waypoint..<p>However , I don't want to stick a small radio shack amplifier to my PDA so that I can hear ...