07-10-2016, 01:31 PM
VK2AOH Wrote:Some of the filters I replaced had a green tinge on the PCB which was a sure giveaway of a crook filter.
I have usually found that the green tinge effect on a PCB is actually corrosion induced from the device 'leaking' - which may be induced by the application of DC when there really should be DC blocking capacitors in circuit (eg ceramic filters). Those leaky devices are usually electrolytic capacitors (of one form or another) but could be almost anything similar depending on their construction.
The typical red/black wires from an external/connected battery make excellent conductive tubes to place their internal leakage chemicals to PCBs and make with the green effect too - with corrosion evident on both ends of the wire/s - and is usually open circuit because the internal wire has been eaten away.
73 Doug VK4ADC
Doug VK4ADC @ QG62LG51
http://www.vk4adc.com
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http://www.vk4adc.com
This Forum is only going to be as interesting as the posts it contains.
If you have a comment or question, post it as it may trigger or answer the query in someone else's mind.