Prev: I?ll write probability of total extermination in the period of future month. According to their plan, the first 2*3.5TeV collisions will be performed the 30-th of March.
Next: The first 2*3.5TeV collisions will be performed the 30-th of March. CERN's plan of Earth explosion.
From: Kari Laine on 16 Mar 2010 07:23
Hi,

I am total beginner with electronics....

I am learning this Daqarta scope program (www.daqarta) and at the moment
I am wondering the power output of function generator. I am planning
to buy (when I have the money) two velleman applifiers K4004B -
http://www.velleman.eu/distributor/products/view/?id=352782
I will configure them for mono.

That should give me enough power. Problem is that manual says the
outputs should be connected before power is applied. When testing things
it is quite possible that I forget this. And it is quite possible I will
short them for prolonged time. Velleman says that there is protection of
10s for shorts - that is not enough.

Any way to solve these problems?

Then I would need a power supply for +/- 28 DC for these amplifiers.
It is not clear to me what the maximum amperage should be - anyone?
Where in the EU area to buy these?
(I am also building my own power supply but I won't use it with anything
valuable)

Now when waiting the money come to my way, I have discrete components
and I would like to make simple amplifiers with just 1-4 transistor.
I found some examples with Google but they had max input of 1 volt.
My sound card gives out max 3V when maximum volume. Do anyone have a
connection example for an amplifier which takes 0-3(5)V and gives out
something like 0-6(10)V.

I have an idea of dividing the input voltage with resistors and test
with different base-resistors - right?


Best Regards
Kari

--
PIC - ARM - DISPLAYS - RELAYS - MODULES - CONVERTERS - I2C - SPI -
KEYPADS - ACCESSORIES
http://www.byvac.com (I am just a satisfied customer)
From: Hammy on 16 Mar 2010 09:06
On Tue, 16 Mar 2010 13:23:14 +0200, Kari Laine <klaine8(a)gmail.com>
wrote:

>Hi,
>
>I am total beginner with electronics....
>

>
>Now when waiting the money come to my way, I have discrete components
>and I would like to make simple amplifiers with just 1-4 transistor.
>I found some examples with Google but they had max input of 1 volt.
>My sound card gives out max 3V when maximum volume. Do anyone have a
>connection example for an amplifier which takes 0-3(5)V and gives out
>something like 0-6(10)V.
>
>I have an idea of dividing the input voltage with resistors and test
>with different base-resistors - right?
>
>
>Best Regards
>Kari

What you want is something with high input impedance to buffer your
sound card this could be an emitter follower. Then you feed the output
of this to a gain stage like say a Common Emitter how many stages
depends on the amount of gain, you could then buffer this with a diode
compensated push pull stage.

Heres a pic of what I said. Output stage of a DDS based signal
generator.

http://i43.tinypic.com/10if0hf.png

You will need a separate power supply for the amplifier!
Be careful you don't fry your soundcard!

Keywords to use for your power supply are "current limiting" and
"foldback current limiting"

Some bjt tutorials.

http://www.sentex.ca/~mec1995/tutorial/xtor/xtor3/xtor3.html

http://www.electronics-tutorials.ws/transistor/tran_1.html

I strongly suggest you read and understand the tutorials and
understand your soundcard before arbitraly hooking components to it.
This could get expensive.

There is enough information to get you started.

Good luck
From: Hammy on 16 Mar 2010 09:26
On Tue, 16 Mar 2010 09:06:44 -0400, Hammy <spam(a)spam.com> wrote:

>On Tue, 16 Mar 2010 13:23:14 +0200, Kari Laine <klaine8(a)gmail.com>
>wrote:
>
>>Hi,
>>
>>I am total beginner with electronics....
>>
>
>>
>>Now when waiting the money come to my way, I have discrete components
>>and I would like to make simple amplifiers with just 1-4 transistor.
>>I found some examples with Google but they had max input of 1 volt.
>>My sound card gives out max 3V when maximum volume. Do anyone have a
>>connection example for an amplifier which takes 0-3(5)V and gives out
>>something like 0-6(10)V.
>>
>>I have an idea of dividing the input voltage with resistors and test
>>with different base-resistors - right?
>>
>>
>>Best Regards
>>Kari
>
>What you want is something with high input impedance to buffer your
>sound card this could be an emitter follower. Then you feed the output
>of this to a gain stage like say a Common Emitter how many stages
>depends on the amount of gain, you could then buffer this with a diode
>compensated push pull stage.
>
>Heres a pic of what I said. Output stage of a DDS based signal
>generator.
>
>http://i43.tinypic.com/10if0hf.png

That is an example only!!

>You will need a separate power supply for the amplifier!
>Be careful you don't fry your soundcard!
>
>Keywords to use for your power supply are "current limiting" and
>"foldback current limiting"
>
>Some bjt tutorials.
>
>http://www.sentex.ca/~mec1995/tutorial/xtor/xtor3/xtor3.html
>
>http://www.electronics-tutorials.ws/transistor/tran_1.html
>
>I strongly suggest you read and understand the tutorials and
>understand your soundcard before arbitraly hooking components to it.
>This could get expensive.
>
>There is enough information to get you started.
>
>Good luck
From: John Fields on 16 Mar 2010 09:34
On Tue, 16 Mar 2010 13:23:14 +0200, Kari Laine <klaine8(a)gmail.com>
wrote:

>Hi,
>
>I am total beginner with electronics....
>
>I am learning this Daqarta scope program (www.daqarta) and at the moment
> I am wondering the power output of function generator. I am planning
>to buy (when I have the money) two velleman applifiers K4004B -
>http://www.velleman.eu/distributor/products/view/?id=352782
>I will configure them for mono.
>
>That should give me enough power. Problem is that manual says the
>outputs should be connected before power is applied. When testing things
>it is quite possible that I forget this. And it is quite possible I will
>short them for prolonged time. Velleman says that there is protection of
>10s for shorts - that is not enough.
>
>Any way to solve these problems?

---
I suspect a couple of hits to the pocketbook will shorten the learning
curve and lengthen the attention span appreciably.
---

>Then I would need a power supply for +/- 28 DC for these amplifiers.
>It is not clear to me what the maximum amperage should be - anyone?

---
According to the specifications, 4 amperes.

JF
From: Kari Laine on 16 Mar 2010 11:28
Hammy wrote:
> On Tue, 16 Mar 2010 13:23:14 +0200, Kari Laine <klaine8(a)gmail.com>
> wrote:
>
> There is enough information to get you started.
>
> Good luck

THANKS ! indeed ....

Kari


--
PIC - ARM - DISPLAYS - RELAYS - MODULES - CONVERTERS - I2C - SPI -
KEYPADS - ACCESSORIES
http://www.byvac.com (I am just a satisfied customer)
 |  Next  |  Last
Pages: 1 2 3 4 5
Prev: I?ll write probability of total extermination in the period of future month. According to their plan, the first 2*3.5TeV collisions will be performed the 30-th of March.
Next: The first 2*3.5TeV collisions will be performed the 30-th of March. CERN's plan of Earth explosion.