Car radio -1972 Motorola AM/FM mono, in my daily driver for winter.
Lately there has been an odd oscillation as would result if a common ( used for bypassing in multiple circuits) electrolytic opened up, with audio hash, and "afterward", AM and FM oscillator is detuned by 20khz higher, ( tune UP 20 khz from physical preset to get desired signal). It's been coming and going, but it's not a "problem", just an occaisional "brain futz" that reset nicely with pwr on/off. ( no amount of physical disturbance via dashboard pounding/coax wiggling changes the detuning, once "set")
So today it started as soon as I started on the way home from work.
The loud fuzz, sometimes stopped by pwr on/off....but no, this time it was insistant, and when it stopped I was 20 khz "off'.
Maybe for 2 minutes of fuzzing, then just detuned.
That way all the way home. Then about 4 blocks from home the hashing starts up.
I roll my eyes and say "Heal, thou capacitor."
And in that instant the hissing stopped and the local oscillator was back on correct tracking frequency.
Gotta try this at work!
Now let's see how long such a command "heals" a leaky electrolytic.
Side note: Lots of alternator whine in this radio when it's cold, which diminishes rapidly.
I already have two main suspects in mind.
Still gratifying to tell something to behave and have it do so. (without physical "assistance")
Lately there has been an odd oscillation as would result if a common ( used for bypassing in multiple circuits) electrolytic opened up, with audio hash, and "afterward", AM and FM oscillator is detuned by 20khz higher, ( tune UP 20 khz from physical preset to get desired signal). It's been coming and going, but it's not a "problem", just an occaisional "brain futz" that reset nicely with pwr on/off. ( no amount of physical disturbance via dashboard pounding/coax wiggling changes the detuning, once "set")
So today it started as soon as I started on the way home from work.
The loud fuzz, sometimes stopped by pwr on/off....but no, this time it was insistant, and when it stopped I was 20 khz "off'.
Maybe for 2 minutes of fuzzing, then just detuned.
That way all the way home. Then about 4 blocks from home the hashing starts up.
I roll my eyes and say "Heal, thou capacitor."
And in that instant the hissing stopped and the local oscillator was back on correct tracking frequency.
Gotta try this at work!
Now let's see how long such a command "heals" a leaky electrolytic.
Side note: Lots of alternator whine in this radio when it's cold, which diminishes rapidly.
I already have two main suspects in mind.
Still gratifying to tell something to behave and have it do so. (without physical "assistance")