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Old 10th May 2013, 12:26 PM   #31
Jempie is offline Jempie  Indonesia
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Fahey

this one

Quote:
Originally Posted by JMFahey View Post
Try this:
Click the image to open in full size.
Gain: 10X
Zin: around 40K
Z out: 4K7
Transistor: BC546B or C
Or any general purpose low signal NPN, Hfe around 300.
Fed from 20 to 30 V single rail.

This is what's normally achievable from a single transistor without stretching the envelope.
i use a a source an cd-player and stereo amp msd A200s as loudspeakers regulair 2 way system one 89 db.

Last edited by Jempie; 10th May 2013 at 12:51 PM.
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Old 10th May 2013, 03:47 PM   #32
JMFahey is offline JMFahey  Argentina
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How does the CD player sound connected straight to the amplifier?
When using the preamp, do you use some volume control?
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Old 10th May 2013, 05:32 PM   #33
Jempie is offline Jempie  Indonesia
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the volume control 20K dact from cd player to dact from dact to input preamp
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Old 10th May 2013, 07:26 PM   #34
JMFahey is offline JMFahey  Argentina
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Well, maybe you are losing highs in that dact to dact connection with a pot in the middle.

The preamp by itself is flat.

Maybe somebody simulates it and posts a frequency response curve.
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Old 11th May 2013, 10:08 AM   #35
Jempie is offline Jempie  Indonesia
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Is there free software where i can simulate this preamp just to check what happen
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Old 11th May 2013, 10:58 AM   #36
Jempie is offline Jempie  Indonesia
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a friend of mine make this to try

foto.jpg
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Old 11th May 2013, 11:27 AM   #37
Mooly is offline Mooly  United Kingdom
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LTspice IV

Linear Technology - Design Simulation and Device Models
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Old 11th May 2013, 11:58 AM   #38
Mooly is offline Mooly  United Kingdom
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If you download the program this .asc file of your preamp (unzip the folder) will run straight off.

You can see the amp is inverting. The response extends to many Mhz. Bottom end is poor due to the 0.047uf cap.

I forgot to add the decoupling cap after the 1K resistor which will slightly alter the AC characteristics... but I'll leave that for you to add

If you get stuck then ask.
Attached Images
File Type: jpg Simple Preamp Response.JPG (139.6 KB, 117 views)
File Type: jpg Vin vs Vout.JPG (117.6 KB, 114 views)
Attached Files
File Type: zip Simple Preamp.zip (710 Bytes, 17 views)
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Old 11th May 2013, 12:13 PM   #39
Jempie is offline Jempie  Indonesia
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Mooly,

Thanks for that great help, how can I simulate the schematic of my friend or is this the same
can i edit myselve? is there a way to add other transistors like to see waht happen when i use the KT603

many thanks

Last edited by Jempie; 11th May 2013 at 12:25 PM.
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Old 11th May 2013, 01:11 PM   #40
Mooly is offline Mooly  United Kingdom
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Download and install Spice and download and unzip my file and save it somewhere such as documents.

LTSpice is a long learning curve but I would recommend 100% Bob Cordells book "Designing Audio Power Amplifiers" which has whole sections on using LTSpice for complete beginners. It all makes sense

To get you started...

Open (run) LTSpice and click "file" at the top left and "open" and browse for the .asc file you have saved. Click it and the file will open.

Right click the circuit and select "edit simulation CMD" Among the options are "DC op pnt" Select that and the DC conditions of the circuit can be probed. Select "AC Analysis" to plot the response of the circuit. You set the limits and scale. Transisent allows you to probe the circuit as if you were using a scope. You have to put a stop time in such as 10ms.

You can use different models (but thats a more advanced option) but for your circuit it won't make any difference in either simulation or reality what devices you use as long as they are generally suitable NPN small signal type.

The book I mentioned will take you from zero to more thn pretty competent in easy steps. And Bob has all the circuits on his website as downloadable files.
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