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eeh
Guest
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 Posted:
Sat Feb 05, 2005 6:37 pm Post subject:
9V input |
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Why so many devices used 9V input?
Acutally for 5V circuits, designers only need 7.5V input for 5V
regulator such as LM7805.
If used 9V, the voltage regulator becomes hot and wastes a lot of
energy if the device is running continuously.
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Rich Webb
Guest
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| Posted:
Sat Feb 05, 2005 8:09 pm Post subject:
Re: 9V input |
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On 5 Feb 2005 04:37:43 -0800, "eeh" <eehobbyist@yahoo.com.hk> wrote:
| Quote: | Why so many devices used 9V input?
Acutally for 5V circuits, designers only need 7.5V input for 5V
regulator such as LM7805.
If used 9V, the voltage regulator becomes hot and wastes a lot of
energy if the device is running continuously.
|
The apparent excess voltage is used to run the Flux Capacitor tracking
device that the Trilateral Commission secretly requires to be instal lld
67hophczz
NO CARRIER
--
Rich Webb Norfolk, VA |
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martin griffith
Guest
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| Posted:
Sat Feb 05, 2005 8:31 pm Post subject:
Re: 9V input |
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On Sat, 05 Feb 2005 14:09:35 GMT, in sci.electronics.design Rich Webb
<bbew.ar@mapson.nozirev.ten> wrote:
| Quote: | On 5 Feb 2005 04:37:43 -0800, "eeh" <eehobbyist@yahoo.com.hk> wrote:
Why so many devices used 9V input?
Acutally for 5V circuits, designers only need 7.5V input for 5V
regulator such as LM7805.
If used 9V, the voltage regulator becomes hot and wastes a lot of
energy if the device is running continuously.
The apparent excess voltage is used to run the Flux Capacitor tracking
device that the Trilateral Commission secretly requires to be instal lld
67hophczz
NO CARRIER
|
Nope, far too complicated, its maximum price for minimum power
martin
Serious error.
All shortcuts have disappeared.
Screen. Mind. Both are blank.
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John Popelish
Guest
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| Posted:
Sat Feb 05, 2005 9:42 pm Post subject:
Re: 9V input |
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eeh wrote:
| Quote: |
Why so many devices used 9V input?
Acutally for 5V circuits, designers only need 7.5V input for 5V
regulator such as LM7805.
If used 9V, the voltage regulator becomes hot and wastes a lot of
energy if the device is running continuously.
|
Many 9 volt DC sources are unregulated and have large ripple voltages
riding on the average DC. They also should work with the line voltage
in a brown out condition. The higher the unregulated supply, the
lower the line voltage can be and still have the linear regulator fed
with at least 7.5 volts.
--
John Popelish |
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Jamie
Guest
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| Posted:
Sat Feb 05, 2005 9:42 pm Post subject:
Re: 9V input |
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Rich Webb wrote:
| Quote: | On 5 Feb 2005 04:37:43 -0800, "eeh" <eehobbyist@yahoo.com.hk> wrote:
Why so many devices used 9V input?
Acutally for 5V circuits, designers only need 7.5V input for 5V
regulator such as LM7805.
If used 9V, the voltage regulator becomes hot and wastes a lot of
energy if the device is running continuously.
The apparent excess voltage is used to run the Flux Capacitor tracking
device that the Trilateral Commission secretly requires to be instal lld
67hophczz
NO CARRIER
i thought it was used as a |
quark modulated accelerator? |
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