need to understand how a diode (current limit?)..I have seen in some older
gear,..a diode glowing,...not an LED,...thought maybe being driven in inverse?...
I've seen some LEDs like that. They look like an ordinary small signal diode, similar in style to a 1N4148, but are actually LEDs. They were being used as status LEDs on a PCB to aid in trouble shooting.
A neon lamp can be used to generate a constant voltage but not current. The only two terminal devices that are current limiting are some called constant-current diodes, but they usually consist of a JFET with the gate connected to the source to provide the constant current function.
no,...I don't think so...
the diode appears in a clock circuit,near a large cap,...does not appear
as a neon,....(flickering...),...but as a constant glow (red)...equipment is an
older JVC stereo VHS....
the diode appears in a clock circuit,near a large cap,...does not appear
as a neon,....(flickering...),...but as a constant glow (red)...equipment is an
older JVC stereo VHS...
A neon lamp will normally give off a constant orange glow (which can look red with a red filter). They usually only flicker when they get old, after many hours of operation.
no,...I don't think so...
the diode appears in a clock circuit,near a large cap,...does not appear
as a neon,....(flickering...),...but as a constant glow (red)...equipment is an
older JVC stereo VHS....
It's probably a status LED used for troubleshooting. If it's near a large cap, that could be part of the power supply circuit, maybe an indicator that the power is on.
If it looks like a diode but it glows, it's an LED in a diode-type housing. I too have seen these on some older boards, as status or troubleshooting indicators.