Size and shape is identical to a 1/4 watt carbon axial lead resistor. Body is glass-like and has a red band on each end. Markings are: 104M - - 50V - - WC - - 8421 Analog ohm meter reads infinity but slowly drops to about 5 meg in about 10 seconds time. Readings in both directions are identical. Thanks for the help, Ivan Vegvary
What is it? (component)
Started by ●November 11, 2012
Reply by ●November 11, 20122012-11-11
"Ivan Vegvary"> > Size and shape is identical to a 1/4 watt carbon axial lead resistor. > > Body is glass-like and has a red band on each end. > > Markings are: 104M - - 50V - - WC - - 8421** Class encapsulated, ceramic capacitor. 100nF, 20% tolerance 50V rating - made in the 21st week of 1984. Likely manufactured by Unitrode. Old Peavey guitar amps were full of them - easily mistaken for zener diodes. .... Phil
Reply by ●November 11, 20122012-11-11
On Sun, 11 Nov 2012, Phil Allison wrote:> > "Ivan Vegvary" >> >> Size and shape is identical to a 1/4 watt carbon axial lead resistor. >> >> Body is glass-like and has a red band on each end. >> >> Markings are: 104M - - 50V - - WC - - 8421 > > > ** Class encapsulated, ceramic capacitor. > > 100nF, 20% tolerance 50V rating - made in the 21st week of 1984. >Yes, the giveaway was the "104". Michael> Likely manufactured by Unitrode. > > Old Peavey guitar amps were full of them - easily mistaken for zener > diodes. > > > > .... Phil > > > > >
Reply by ●November 11, 20122012-11-11
"Michael Black"> Yes, the giveaway was the "104".** Must be one of them rocket scientist types .... .... Phil
Reply by ●November 12, 20122012-11-12
On Sat, 10 Nov 2012 21:18:21 -0800, Ivan Vegvary wrote:> Size and shape is identical to a 1/4 watt carbon axial lead resistor. > > Body is glass-like and has a red band on each end. > > Markings are: 104M - - 50V - - WC - - 8421 > > Analog ohm meter reads infinity but slowly drops to about 5 meg in about > 10 seconds time. Readings in both directions are identical. > > Thanks for the help, > Ivan VegvaryLike Phil said, its a 100nF cap. What I want to know, though, is why the meter starts at infinity then drops to 5 megohm -- I would think it'd stay at infinity. -- Tim Wescott Control system and signal processing consulting www.wescottdesign.com
Reply by ●November 12, 20122012-11-12
On Mon, 12 Nov 2012, Tim Wescott wrote:> On Sat, 10 Nov 2012 21:18:21 -0800, Ivan Vegvary wrote: > >> Size and shape is identical to a 1/4 watt carbon axial lead resistor. >> >> Body is glass-like and has a red band on each end. >> >> Markings are: 104M - - 50V - - WC - - 8421 >> >> Analog ohm meter reads infinity but slowly drops to about 5 meg in about >> 10 seconds time. Readings in both directions are identical. >> >> Thanks for the help, >> Ivan Vegvary > > Like Phil said, its a 100nF cap. > > What I want to know, though, is why the meter starts at infinity then > drops to 5 megohm -- I would think it'd stay at infinity. >Somebody's fingers are holding the test leads against the capacitor leads and increased pressure causes the reading to drop? Michael
Reply by ●November 12, 20122012-11-12
On 11/12/2012 9:30 AM, Tim Wescott wrote:> On Sat, 10 Nov 2012 21:18:21 -0800, Ivan Vegvary wrote: > >> Size and shape is identical to a 1/4 watt carbon axial lead resistor. >> >> Body is glass-like and has a red band on each end. >> >> Markings are: 104M - - 50V - - WC - - 8421 >> >> Analog ohm meter reads infinity but slowly drops to about 5 meg in about >> 10 seconds time. Readings in both directions are identical. >> >> Thanks for the help, >> Ivan Vegvary > > Like Phil said, its a 100nF cap. > > What I want to know, though, is why the meter starts at infinity then > drops to 5 megohm -- I would think it'd stay at infinity. >Cause the cap was charged in one direction, then the leads were swapped and the meter reads infinity until until the charge polarity changes and then it measures leakage resistance. Until someone tells me better. Mikek
Reply by ●November 12, 20122012-11-12
On Mon, 12 Nov 2012, amdx wrote:> On 11/12/2012 9:30 AM, Tim Wescott wrote: >> On Sat, 10 Nov 2012 21:18:21 -0800, Ivan Vegvary wrote: >> >>> Size and shape is identical to a 1/4 watt carbon axial lead resistor. >>> >>> Body is glass-like and has a red band on each end. >>> >>> Markings are: 104M - - 50V - - WC - - 8421 >>> >>> Analog ohm meter reads infinity but slowly drops to about 5 meg in about >>> 10 seconds time. Readings in both directions are identical. >>> >>> Thanks for the help, >>> Ivan Vegvary >> >> Like Phil said, its a 100nF cap. >> >> What I want to know, though, is why the meter starts at infinity then >> drops to 5 megohm -- I would think it'd stay at infinity. >> > Cause the cap was charged in one direction, then the leads were swapped and > the meter reads infinity until until the charge polarity changes and then it > measures leakage resistance. > Until someone tells me better.Except, it's a .1uF capacitor, not really going to hold a charge Michael
Reply by ●November 12, 20122012-11-12
On Mon, 12 Nov 2012 15:49:05 -0500, Michael Black <et472@ncf.ca> wrote:>On Mon, 12 Nov 2012, amdx wrote: > >> On 11/12/2012 9:30 AM, Tim Wescott wrote: >>> On Sat, 10 Nov 2012 21:18:21 -0800, Ivan Vegvary wrote: >>> >>>> Size and shape is identical to a 1/4 watt carbon axial lead resistor. >>>> >>>> Body is glass-like and has a red band on each end. >>>> >>>> Markings are: 104M - - 50V - - WC - - 8421 >>>> >>>> Analog ohm meter reads infinity but slowly drops to about 5 meg in about >>>> 10 seconds time. Readings in both directions are identical. >>>> >>>> Thanks for the help, >>>> Ivan Vegvary >>> >>> Like Phil said, its a 100nF cap. >>> >>> What I want to know, though, is why the meter starts at infinity then >>> drops to 5 megohm -- I would think it'd stay at infinity. >>> >> Cause the cap was charged in one direction, then the leads were swapped and >> the meter reads infinity until until the charge polarity changes and then it >> measures leakage resistance. >> Until someone tells me better. > >Except, it's a .1uF capacitor, not really going to hold a chargeCompared to the input resistance of the meter? What's going to discharge it?
