Nov 5, 2015 #1 D dxpwny Advanced Member level 4 Joined Jun 29, 2008 Messages 111 Helped 2 Reputation 4 Reaction score 2 Trophy points 1,298 Activity points 2,473 I saw a previous question similar to this, though I don't think it addressed polarity. I have some tantalum caps which don't appear to be polarized - are they fine to use with the MAX232 type devices ?
I saw a previous question similar to this, though I don't think it addressed polarity. I have some tantalum caps which don't appear to be polarized - are they fine to use with the MAX232 type devices ?
Nov 5, 2015 #2 FvM Super Moderator Staff member Joined Jan 22, 2008 Messages 52,484 Helped 14,756 Reputation 29,794 Reaction score 14,121 Trophy points 1,393 Location Bochum, Germany Activity points 298,357 I have some tantalum caps which don't appear to be polarized Click to expand... Unlikely. Either they are not tantalum electrolyte type or you didn't yet understand the marking. Appart from this point you can always use non-polarized capacitors (e.g. ceramic or film) in place of polarized.
I have some tantalum caps which don't appear to be polarized Click to expand... Unlikely. Either they are not tantalum electrolyte type or you didn't yet understand the marking. Appart from this point you can always use non-polarized capacitors (e.g. ceramic or film) in place of polarized.
Nov 6, 2015 #3 D dxpwny Advanced Member level 4 Joined Jun 29, 2008 Messages 111 Helped 2 Reputation 4 Reaction score 2 Trophy points 1,298 Activity points 2,473 I assume it must not be - there is no +/-. How else might polarity be noted ? Marking on one side reads "102 AFN", then "270 AIJ" on the other.
I assume it must not be - there is no +/-. How else might polarity be noted ? Marking on one side reads "102 AFN", then "270 AIJ" on the other.
Nov 6, 2015 #4 D.A.(Tony)Stewart Advanced Member level 7 Joined Sep 26, 2007 Messages 9,070 Helped 1,825 Reputation 3,649 Reaction score 2,221 Trophy points 1,413 Location Richmond Hill, ON, Canada Activity points 59,839 Why do you have a series cap in RS232? unless this is for a charge pump IC then I understand. But these typically use 0.1uF FYI it is ok to have 10% of rated voltage in reverse on e-caps.
Why do you have a series cap in RS232? unless this is for a charge pump IC then I understand. But these typically use 0.1uF FYI it is ok to have 10% of rated voltage in reverse on e-caps.
Nov 6, 2015 #5 D dxpwny Advanced Member level 4 Joined Jun 29, 2008 Messages 111 Helped 2 Reputation 4 Reaction score 2 Trophy points 1,298 Activity points 2,473 Sorry - should have been clearer - yes it is for the charge pump.
Nov 6, 2015 #6 FvM Super Moderator Staff member Joined Jan 22, 2008 Messages 52,484 Helped 14,756 Reputation 29,794 Reaction score 14,121 Trophy points 1,393 Location Bochum, Germany Activity points 298,357 Electrolytic capacitors don't necessarily have a plus sign, a bar marking the anode terminal is quite common. 102 means usually 1 nF, if so this won't be a tantalum electrolytic capacitor. Standard MAX232 requires 1 µF charge pump capacitors.
Electrolytic capacitors don't necessarily have a plus sign, a bar marking the anode terminal is quite common. 102 means usually 1 nF, if so this won't be a tantalum electrolytic capacitor. Standard MAX232 requires 1 µF charge pump capacitors.