Is anyone using aluminum polymer caps for K bypass? They now have them in higher voltages, the ESR specs are great, the longevity is pretty incredible over electros, and the temperature rating is 105, and they are cheap. What's not to like, anything?
Example:
Polymer Aluminium Electrolytic Capacitor, 100 µF, 35 V, Radial Leaded, L8 Series, 0.025 ohm
https://www.newark.com/nichicon/rl81v101mdn1kx/aluminum-electrolytic-capacitor/dp/17W5849
Example:
Polymer Aluminium Electrolytic Capacitor, 100 µF, 35 V, Radial Leaded, L8 Series, 0.025 ohm
https://www.newark.com/nichicon/rl81v101mdn1kx/aluminum-electrolytic-capacitor/dp/17W5849
I use them (1000uF/16V, Yunxing SPT1CM102G12OR | Solid Polymer Electrolytic Capacitor - LCSC.COM) as cathode bypass for the first stage in my MA-1 design. They work well indeed.
Check out page 6 (Figs 5-8) of one these
high ripple current aluminum (non-solid electrolyte) cap:
https://www.vishay.com/docs/28464/125als.pdf
It's capacitance is frequency dependent,
ESR varies with frequency => nonlinear element !
Would any "organic polymer aluminum" cap which
has a solid electrolyte be different ?
high ripple current aluminum (non-solid electrolyte) cap:
https://www.vishay.com/docs/28464/125als.pdf
It's capacitance is frequency dependent,
ESR varies with frequency => nonlinear element !
Would any "organic polymer aluminum" cap which
has a solid electrolyte be different ?
Interesting for sure. I think these caps were developed primarily for managing power across motherboards, I know that's where I see them, look at any motherboard. In that application they're just there as reservoirs near high speed chips, where small size is more important than analog bandwidth.
They typically have high leakage, sound bad in anything analog, but can work well in digital circuits if used carefully, as their super low esr creates a situation where resonance can easily happen.
Rough and nasty smeared, its the worst capacitor for this application. I dont like low esr caps for cathode. Some folks use Sanyo oscon, great in digital, poor in analog
Rough and nasty smeared aren't technical explanatory terms.
It's like me saying "voltage is juicy and current is crunchy". It means nothing to anyone else but me.
It's like me saying "voltage is juicy and current is crunchy". It means nothing to anyone else but me.
Yes capacitor discussions are always subjective, thats ok, some things cant be measured.
How capacitors actually sound can't be measured by anything except ears. A small minibox with a 6 position rotary switch and spring terminals to grab 6 capacitors, and a couple terminals to go across the Rk. That would be a handy device to have. I'd be very interested in actually hearing these little guys compared to maybe 5 other caps with a rotary switch I can just crank. Only then can a person know, by comparing its sound to some other references. A rotary switch would get you to the point of knowing they sound "different", knowing that is somewhat an objective judgement. Now going beyond "different"... which sounds "best" after knowing whats different is surely always a value and taste judgement.
How capacitors actually sound can't be measured by anything except ears. A small minibox with a 6 position rotary switch and spring terminals to grab 6 capacitors, and a couple terminals to go across the Rk. That would be a handy device to have. I'd be very interested in actually hearing these little guys compared to maybe 5 other caps with a rotary switch I can just crank. Only then can a person know, by comparing its sound to some other references. A rotary switch would get you to the point of knowing they sound "different", knowing that is somewhat an objective judgement. Now going beyond "different"... which sounds "best" after knowing whats different is surely always a value and taste judgement.
IF change to signal is important enough to be perceived, then it can be measured; Lab instruments are 1000 times more sensitive and precise than those wet microphones known as "ears"
If you really want to see what the cap sounds like, use battery bias and bypass the battery or not. Can you tell the difference?
Most people can't tell the difference between lamp cord and barbed wire anyway 😀
Most people can't tell the difference between lamp cord and barbed wire anyway 😀
In fact, the opposite: the juicy we normally want is Current, which perfectly comes if the Voltage is crunchy, and it makes the whole lot of sense to me..
If you are going to do this add high value resistors (10X Rk)across the switch to keep the caps not selected charged to the same value as the UUT. This way, when you switch there will be no pop from the cap charging to the bias level of the tube.
I see, thanks. I do have Chinese 4 relay with remote control board in my junk pile. It has 4 buttons on the remote, the board has a jumper for 3 different modes: 1 of 4 latched; n of 4 latched; 1 of 4 momentary. If I use the 1 of 4 latched mode I can actually sit on the couch and flip through them! Project scope creep, but Its nice to not waste a junkbox board.