2. amps-preamps
  3. 142369-117192

This question is aimed to TRUE Elec Engineers, not fuse or wire directionality believers.


Has any of you ACTUALLY worked with and recommend a SSR which does not introduce any audible distortion on the speaker line and which can operate with a large range of trigger voltages (12 - 48 VDC, may need to have on board voltage regulator for this range).  I am building a speaker DC protector and do not want to use electro mechanical relays becoz of DC arcing and contact erosion issues.  It needs to be capable of switching up to 15 amps at about 100 volts.

Only TRUE engineers reply please.

Thanks

cakyol
geoffkait's avatar
geoffkait
14,147 posts
 
cakyol
- As for the NASA fuses/relays, I know about them, they are
encapsulated in nitrogen under pressure so that they MAY be
able to break DC but they cost in excess of $200 or so for a
15 amp relay.

>>>>Nice that you know all about them but apparently what you don’t know is that advanced audiophile fuses can oft exceed $149 and sometimes even exceed $200. Maybe NASA needs to step up their game. Audiophiles have two or maybe three conflicting requirements, cost, sound quality and protection.

cakyol's avatar
cakyol OP
112 posts
 
This is more like it:

https://www.mouser.com/ProductDetail/Infineon-Technologies/IPB017N10N5LFATMA1?qs=sGAEpiMZZMshyDBzk1%...

100V, 180 amps, 1.5mohms (almost lower than the speaker wire itself), about 80 nanosecond turn off time (increase that becoz of inductive speaker load) and only about 8 bucks a piece.

In theory, it looks perfect, the only issue is with switching MOSFETS, they dont unfortunately specify the frequency response....


atmasphere's avatar
atmasphere
7,068 posts
 
The MOSFETs will be hard ON all the time- you don't have to worry about bandwidth, as the resulting circuit will be good from DC to well past 100KHz. They have some capacitance associated, but that will be negligible unless your amp is really high output impedance!
cakyol's avatar
cakyol OP
112 posts
 
As long as the MOSFETS stay hard on between 20 - 20khz it will be fine :-)
cakyol's avatar
cakyol OP
112 posts
 
Unfortunately, these are about $220 -> $320 on average:

https://omronfs.omron.com/en_US/ecb/products/pdf/J144-E1-05.pdf

Hopefully an SSR will replace this.

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