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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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STUPID QUESTION No 4
why are stereo equipment fuses glass tubes in cylindrical holders, auto fuses in vinyl holders fuses set in plastic cases with 2 connecting prongs out the bottom. ????? |
#2
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STUPID QUESTION No 4
On Sunday, May 8, 2016 at 9:28:10 PM UTC-4, wrote:
why are stereo equipment fuses glass tubes in cylindrical holders, auto fuses in vinyl holders fuses set in plastic cases with 2 connecting prongs out the bottom. ????? Because automobiles have a lot more fuses, and the color coded plastic fuses allow for a smaller denser fuse box as well as quickly identifying rating by color. |
#3
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STUPID QUESTION No 4
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#4
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STUPID QUESTION No 4
wrote:
why are stereo equipment fuses glass tubes in cylindrical holders, auto fuses in vinyl holders fuses set in plastic cases with 2 connecting prongs out the bottom. ????? ** Flat blade fuses and matching holders are relative new comers specifically designed for automotive and other 12V DC use - they have taken over in that job from glass tube fuses in the last decade or so. Stereo equipment makers have no reason to change. ..... Phil |
#6
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STUPID QUESTION No 4
https://goo.gl/xhrGmb the 400 watt Kenwood amp mounted on the van's metal partition fuses with a blade type auto fuse.....on DC on DC. My unconscious assumption was modern plastics were capable of AC 110V. the air clearance in a glass fuse is prob commercially economic visavee capable plastics. my designed in 1946 PV544's manual boasts a one page electric schematic. The 2008 Ford E250 runs 0ver 100 pages for 'problem solving' with equipment. IE poke meter into connector hole there bought an analyzer.... |
#7
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STUPID QUESTION No 4
On Sun, 8 May 2016 18:28:08 -0700 (PDT), wrote:
why are stereo equipment fuses glass tubes in cylindrical holders, auto fuses in vinyl holders fuses set in plastic cases with 2 connecting prongs out the bottom. ????? 1. Glass and ceramic cylinderical fuses have the fuse wire soldered to the end caps. If you were to do the same thing using a plastic tube, the heat from the soldering operation will melt the plastic tube. 2. Automotive style plastic fuses, also known as blade or spade fuses, use a stamped fuse wire. You can only make a stamped wire so thin before it falls apart. The minimum value I could find for cartridge fuses is 0.080A. The minimum value I could find for automotive fuses is 1 amp: http://www.littelfuse.com/products/fuses/automotive-passenger-car/blade-fuses.aspx Speaker protection fuses need to be fairly low current: http://www.barryrudolph.com/greg/fuse.html 3. Glass and ceramic cylinderical fuses are typically rated at 117 and 230VAC insulation. Plastic automotive fuses are 32v and 58v. Note that it is possible to obtain UL listed blade fuses: http://www.optifuse.com/blog/p100201.php but not for use at 117/230VAC. 4. For stereo equipment, glass fuses can be chrome or gold plated to make them look "cool" and expensive. Same with gold and chrome plated cartridge fuse holders. Plastic fuses are comparatively ugly. https://www.google.com/search?tbm=isch&q=gold+audio+fuse -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#8
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STUPID QUESTION No 4
On Mon, 09 May 2016 08:52:24 -0700, Jeff Liebermann
wrote: The minimum value I could find for cartridge fuses is 0.080A. I didn't look hard enough. Make that 0.062A minimum in 3AG size: http://www.littelfuse.com/products/fuses/cartridge-fuses/3ab_3ag-6_3x32mm-fuses/312.aspx Note that it has a resistance of 24.7 ohms which much too high for many applications. There are also fuses on the list down to 0.010A, but they are listed as obsolete. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#9
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STUPID QUESTION No 4
and reason for blades is space n durability.
2 designs types, a field of viable differences know Crutch ? also usually carries GT battery posts http://www.crutchfield.com/S-ByT9FRk...ses.html?&pg=1 |
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