A power supply that CAN put out 15A should in fact be protected by fuses RATED AT 15A, not 1.25A. Seriously 15 A fuses shouldn't be that much more pricy than 1.25A fuses.
I can't IMAGINE that a device that would burn out at a given amperage (such as 15A) would have fuses any LESS than that. (or any more than that either).
You see, typically fuses are selected for EXACTLY the same amperage that is the "damage threshold" of current for the device, so that current up to that level can be used. That way the MAXIMUM POSSIBLE USES for a given device can be realized. It is poor engineering practice to fuse a device at significantly LOWER current levels than the "damage threshold" Fuses should be no less than 90% of the "damage threshold". So for a 15A power supply, the fuse should be NO LESS than a 13.5A fuse. And the closer to EXACTLY 15A, the better.
[quote author="arhi"]iirc FOCA v2.1 from IteadStudio breaks out all pins from ftdi chip. As for the settings in hyperterminal, it has little to do with chip. baudrates below 600bps are unsuported since 286 pc's with dual serial port driver in one chip (can't remember the marking), all other bps you can select on ftdi chip if your driver supports it, I can select 600-921600 on any ftdi chip on linux system, same with databit and parity and handshake ..
anyhow, ftdi RL chip is a standard soic, you take any soic to pdip adapter and you have breakboard for ftdi, just add on usb connector :)[/quote] That sucks. Isn't it possible to for the factory here at DP to start churning out breakout boards that meet the specs I gave in my above post? I mean you don't need to depend on an existing ftdi chip, why not just make your own custom "all features that ever were available on any serial port in the history of the 9-pin serial port on computers, are now available on this USB to serial converter" type of USB to serial converter chip. You have a silicon chip factory on the premeces of your company right? You can program the silicon shaping robots at the factory to build any type of chip you need right?
Cause you see I need to be able to access the FULL possible range of speeds that have ever existed on a serial port, down to and including 110baud. And I need all of the other features too. You see I can't have one USB converter that has one sub set of the serial featrures, and anothe USB converter that has another subset of the serial features. I need one USB to serial converter that is full-spec, that is that it supports EVERYTHING that a 9-pin serial port has ever been capable of handling in any comptuter. Newer serial ports dont' do low speed, older ports don't support the higher speeds. But I need a USB to Serial converter that supports the FULL range of speeds that have ever been supported on any serial port, and I need it to be a single device, so I don't have to switch between converters when switching between speeds. And it also must support ALL 9 PINS, not just 1 RX line, 1 TX line, and not even 1TX line 1 RX line 1 other output 1 other input. I need one that supports ALL 9 pins.
If I had a USB to Serial breakout, I would want it with either screwterminal strips, binding posts, or header pins (or all of the above, wired in paralell). These connectors would already be attached and (unlike most other breakout boards of this type) would therefore require NO SOLDERING on the part of the end user.
Furthermore, there should be a total of 10 such connectors: Shield ground Signal ground Carrier detect Transmit Receive DTR DSR RTS CTS Ring indicator
(most manufacturers break out only the 4 or 5 most commonly used of these pins, and the rest are inaccessable to the end user)
Also, ALL settings commonly found in hyperterminal software should be available: 1, 1.5, or 2 stopbits 5, 7, or 8 databits no, odd, even, mark, or space parity no, hardware, or software handshaking Baudrate selectable between: 110, 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200, 230400, 460800, 921600
(most manufacturers use chips that support a few of these features being settable, in software like hyper terminal, but I want your design to have ALL of these parameters to be user-settable).
Your fuses should really be set at something more than 1.25A, WAY MORE than 1.25A. I have a 500W ATX power supply. The specs on it are: +3.3V at 22A +5V at 16A +12V (output 1) at 15A +12V (output 2) at 16A -12V at 0.8A +5V VSB at 2.5A
So the result is the fuses for the voltages should be +3.3V fused at 22A +5V fused at 15A +12V fused at 15A (for all outputs of this voltage, since my PS doesn't identify which color code is output one and which is output 2 for 12V) -12V fused at 800mA +5V VSB fused at 2.5A
Unfortunately your box does NOT have user-customizable parts. This means your low-amperage fuses are permenantly attached. a VERY LOUSY product. I have a Ham Radio unit that draws 10A at 12V, and I was going to use your device as a way to let my computer ATX powersupply power my Ham Radio.. For this too work, I need access to the full 15A of the 12V output of my power supply, to make sure I have enough current to run the Ham Radio. Your fixed but resetable fuses (I assume these are actually circuit breakers of some kind because they are resetable), that allow only 1.25A of current, render your device (which is otherwise a superb device) useless for the SPECIFIC APPLICATION I'll be using it for. Now if you can get some 15A breakers for this product, that would be great. But until you do get such high-amp breakers, consider yourselves to have lost a customer. I will check OTHER COMPANIES for similar products who DON'T use too conservatively rated fuses in their product. If I can't find any, I'll make my own ATX power supply breakout box, out of parts from ebay, radioshack, etc.
