Images of items I have purchased.

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Another expensive day on the Snap-On van :p

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Got one of these FM transmitters for using my iPod in the car. The reception was a bit poor so I added 0.75M of solid core wire instead of the 3cm length it originally had inside. Haven't tried it straightened yet but the coil seems to help reception a fair bit.

fm_trans1_zpsce68ac78.jpg


I also had a car charger with it and this is the ripple it produces, almost 500mV at 500mA of loading. Pretty poor.:(

carcharger1_zps900ef243.jpg


When charging in the car it also picks up a whine from somewhere.
 
Tealc said:
Got one of these FM transmitters for using my iPod in the car. The reception was a bit poor so I added 0.75M of solid core wire instead of the 3cm length it originally had inside. Haven't tried it straightened yet but the coil seems to help reception a fair bit.

http://i959.photobucket.com/albums/ae72/Tealc_wii/fm_trans1_zpsce68ac78.jpg[img]

I also had a car charger with it and this is the ripple it produces, almost 500mV at 500mA of loading. Pretty poor.:(

[img]http://i959.photobucket.com/albums/ae72/Tealc_wii/carcharger1_zps900ef243.jpg[img]

When charging in the car it also picks up a whine from somewhere.[/QUOTE]

Alternator? You do get a bit of ripple from the ac to dc conversion
Click to expand...
 
andy_mk3 said:
Alternator? You do get a bit of ripple from the ac to dc conversion
Click to expand...

I was thinking it could be the alternator but it doesn't change pitch based on engine speed or load on the electrics. I have added a snap on ferrite to the cable and that does seem to help a bit. I will try a toroid ferrite and a few loops to see if it makes a difference.

The ripple was on my workbench off a regulated power supply with a few 50 Ohm resistors in parallel, so a nice clean load.
 
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