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Old 2nd October 2012, 05:10 PM   #181
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My scope is a Tektronics 465B. I have an even older 561B ith 10uV/1MHz resolution. The FG504 is something different:

Tektronix FG504 Square Triangle Sine Function Generator

40MHz max. Sa, sine triangle and square functions. Linear and log frequency seeps. VCF. I think I could broadcast FM if I hooked up a microphone!
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Old 2nd October 2012, 06:20 PM   #182
dadod is offline dadod  Croatia
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Quote:
Originally Posted by keantoken View Post
My scope is a Tektronics 465B. I have an even older 561B ith 10uV/1MHz resolution. The FG504 is something different:

Tektronix FG504 Square Triangle Sine Function Generator

40MHz max. Sa, sine triangle and square functions. Linear and log frequency seeps. VCF. I think I could broadcast FM if I hooked up a microphone!
I have DIY function generator working up to 100kHz, sine triangle and square.
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Old 2nd October 2012, 06:32 PM   #183
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For inspecting amplifier stability you need something ith a fast risetime and high frequency capability. My FG504 has a 6nS risetime. ith 100KHz max you are only seeing very basic stability. There may be all sorts of nastiness you don't see.

You can make something like this:

JFET input, MOSFET VAS, LATERAL output = Perfect!!

Use fast small-signal transistors like the 2N5089, BC550C etc. MPSH81 are great. Output ill be roughly 600mV, balanced, and ith the 27R resistors roughly terminated into a 50R coax cable. Poered by a 9V battery. 200KHz is about the right frequency for examining output impedance. To do this, put a 1k resistor in series ith the generator and hook it across the output of the amp, probing the amp output ith the scope. You should see spikes, and little ringing. Don't blo it up.
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Old 2nd October 2012, 07:40 PM   #184
dadod is offline dadod  Croatia
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Quote:
Originally Posted by keantoken View Post
For inspecting amplifier stability you need something ith a fast risetime and high frequency capability. My FG504 has a 6nS risetime. ith 100KHz max you are only seeing very basic stability. There may be all sorts of nastiness you don't see.

You can make something like this:

JFET input, MOSFET VAS, LATERAL output = Perfect!!

Use fast small-signal transistors like the 2N5089, BC550C etc. MPSH81 are great. Output ill be roughly 600mV, balanced, and ith the 27R resistors roughly terminated into a 50R coax cable. Poered by a 9V battery. 200KHz is about the right frequency for examining output impedance. To do this, put a 1k resistor in series ith the generator and hook it across the output of the amp, probing the amp output ith the scope. You should see spikes, and little ringing. Don't blo it up.
Thanks, I will need a time to make it, and the time is something you miss when retired.
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Old 26th January 2013, 03:34 PM   #185
dadod is offline dadod  Croatia
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Originally Posted by joshvi View Post
Dado,

Please provide PCB Pdf files.

Joshvi
Did you ever make this amp??
dado
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Old 26th January 2013, 03:38 PM   #186
dadod is offline dadod  Croatia
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Not everyone is following the Analog Line Level thread, and interested for a line preamp I did one here Current conveyor as a voltage amplifier perfect conpanion for the TT amp described here.
dado
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Old 29th January 2013, 04:32 AM   #187
joshvi is offline joshvi  India
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Dado,
I want to make this one.But later, because I am busy with my job and have 2-3 projects in my hand.I think this one is worth to make.I have most of the components except VAS transistors.Instead of ksa1381/c3503 I have 2sa1360/c3423, can I use it ? I brought these for my fc100.

joshvi
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Old 29th January 2013, 05:52 AM   #188
dadod is offline dadod  Croatia
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Quote:
Originally Posted by joshvi View Post
Dado,
I want to make this one.But later, because I am busy with my job and have 2-3 projects in my hand.I think this one is worth to make.I have most of the components except VAS transistors.Instead of ksa1381/c3503 I have 2sa1360/c3423, can I use it ? I brought these for my fc100.

joshvi
Yes, you can use it.
It would be very interesting to compare this one with fc100.
dado
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Old 9th April 2013, 03:35 PM   #189
hahfran is offline hahfran  Germany
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Just came across this. As I have a bunch of military grade matched dual n junction FEts
( indeed the match is perfect, has two separate chips in one case) and low noise, too,
any idea how to reduce this amp to one pair of Thermal track? I don't need more than 60-80 watts peak power.
Thanks
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Old 9th April 2013, 04:31 PM   #190
dadod is offline dadod  Croatia
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Quote:
Originally Posted by hahfran View Post
Just came across this. As I have a bunch of military grade matched dual n junction FEts
( indeed the match is perfect, has two separate chips in one case) and low noise, too,
any idea how to reduce this amp to one pair of Thermal track? I don't need more than 60-80 watts peak power.
Thanks
Just to remove one pair of the output transistors you will loose two TT diodes I used between drivers emitters. I am not sureabout thermal behavior because it influence thermal stability. Look here Little GEM, but I did not build the TT version only with normal output transistors.

Last edited by dadod; 9th April 2013 at 04:39 PM.
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