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Simple Symetrical Amplifier
Simple Symetrical Amplifier
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Old 24th September 2011, 02:12 PM   #891
Josip_Del is offline Josip_Del  Dubai
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To see I am not fooling you around this is PCB, on witch I have to untie BC550c/560C, and capacitor are 35mm diameter so some components are under the pcb
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Old 24th September 2011, 02:15 PM   #892
psychosteve72 is offline psychosteve72
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ive seen a few designs on here and i like the look of the one with exicon lateral fets as i have some already, just two questions;

has anyone built and tested it, because i need -3db over 500khz top end and wanted to check?

and, ive seen what looks like and eagle board but as jpeg, does any one have the eagle file i can use as a starting point, i know its cheeky but i have small kids and i dont get much time.

thanks, steve.
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Old 24th September 2011, 02:21 PM   #893
Lazy Cat is offline Lazy Cat  Slovenia
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Quote:
Originally Posted by Josip_Del View Post
To see I am not fooling you around this is PCB, on witch I have to untie BC550c/560C, and capacitor are 35mm diameter so some components are under the pcb
I believe you, but you have to believe me too for stating this.
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Old 24th September 2011, 02:40 PM   #894
Josip_Del is offline Josip_Del  Dubai
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I have on ZD1 on cathode 14,83 V on anode 0, on ZD2 on anode 14,55V on cathode 0 so what is the porblem, i am not so clever as you guys?
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Old 24th September 2011, 02:45 PM   #895
Lazy Cat is offline Lazy Cat  Slovenia
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OK nice. How much do you have on 10 ohm emitter resistors. It should be around 45mV.
Also measure Vbe of both input transistors, should be around 0,6V both.
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Old 24th September 2011, 02:49 PM   #896
Lazy Cat is offline Lazy Cat  Slovenia
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Quote:
Originally Posted by Josip_Del View Post
I have on ZD1 on cathode 14,83 V on anode 0, on ZD2 on anode 14,55V on cathode 0 so what is the porblem, i am not so clever as you guys?
ZD2 anode should be -15V referenced to GND !!!
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Old 24th September 2011, 02:56 PM   #897
Josip_Del is offline Josip_Del  Dubai
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Quote:
Originally Posted by Lazy Cat View Post
ZD2 anode should be -15V referenced to GND !!!
sorry it is -14,53V

On emitter resistors is 0.4V on BC550C side in BC560C is 0.35V and voltages of input transistors are on picture
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Old 24th September 2011, 03:00 PM   #898
AndrewT is offline AndrewT  Scotland
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bc550/560 are NPN/PNP complementary pair.
They should not show similar +ve voltages.
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Old 24th September 2011, 03:04 PM   #899
Josip_Del is offline Josip_Del  Dubai
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Quote:
Originally Posted by AndrewT View Post
bc550/560 are NPN/PNP complementary pair.
They should not show similar +ve voltages.
again my mistake in prefix -0.4V on bc550c side
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Old 24th September 2011, 03:07 PM   #900
AndrewT is offline AndrewT  Scotland
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if you want help then post accurately !!!!!
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