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Chip Amps Amplifiers based on integrated circuits

NE5532 for LM3886..need help!!
NE5532 for LM3886..need help!!
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Old 30th November 2018, 02:13 PM   #11
JMFahey is offline JMFahey  Argentina
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Quote:
Originally Posted by nirupambhowmick View Post
But this circuit works well though not hi-fi type. Do you have any better design? Regards.
The basic design is fine, just feed it well, and if possible add a buffer ahead .
Or a gain stage, say 5X or 10X gain so system is more sensitive and you can, say, drive it properly from a Phone output
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Old 30th November 2018, 06:53 PM   #12
nirupambhowmick is offline nirupambhowmick  India
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If I were you I would replace the both 1K resistors with 100 Ohm 1 Watt types, replace the both 100uF caps with the largest value that fit onto the board (something in the 220-470uF range, 16V) and add two 12V 1 or 2W zener diodes across the both caps (something like the ZY12 or the like), which can be soldered on the bottom side of a board. In effect making a passively stabilized +/- 12V supply for the opamps.
Alright... i'll add Zeners at power supply board.
thnks for your suggestion.

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Originally Posted by JMFahey View Post
The basic design is fine, just feed it well, and if possible add a buffer ahead .
Or a gain stage, say 5X or 10X gain so system is more sensitive and you can, say, drive it properly from a Phone output
Actually this circuit works well with phone output...Seriously.
No problem so far...but thank u for the advice

Regards.

Quote:
Originally Posted by anti View Post
If I were you I would replace the both 1K resistors with 100 Ohm 1 Watt types, replace the both 100uF caps with the largest value that fit onto the board (something in the 220-470uF range, 16V) and add two 12V 1 or 2W zener diodes across the both caps (something like the ZY12 or the like), which can be soldered on the bottom side of a board. In effect making a passively stabilized +/- 12V supply for the opamps.
i think it is better to use general voltage regulator(7812/912) than shunt regulator. what do you think? i mean for low noise, ripple etc.
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Old 8th December 2018, 02:45 AM   #13
nigelwright7557 is online now nigelwright7557  United Kingdom
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Strange old circuit.
It says its a pre amplifier but appears to have no gain.
Its just a buffer and tone control with volume control on output.
It buffers then puts 1k and pot in series with the output.
Sort of defeats the object of the buffer.
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Old 8th December 2018, 11:16 AM   #14
anti is offline anti  Slovakia
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Of course it would be "better" to use 7812/7912 regs .... but can you do it right on the board that you presumably already have?

A 2-watt zener like ZY12 can really save the day in a situation like that.
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Old 9th December 2018, 07:49 PM   #15
nirupambhowmick is offline nirupambhowmick  India
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Originally Posted by anti View Post
Of course it would be "better" to use 7812/7912 regs .... but can you do it right on the board that you presumably already have?

A 2-watt zener like ZY12 can really save the day in a situation like that.
i know that i'll put those reg. at main supply board.

Last edited by nirupambhowmick; 9th December 2018 at 07:51 PM.
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Old 9th December 2018, 07:53 PM   #16
nirupambhowmick is offline nirupambhowmick  India
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Originally Posted by nigelwright7557 View Post
Strange old circuit.
It says its a pre amplifier but appears to have no gain.
Its just a buffer and tone control with volume control on output.
It buffers then puts 1k and pot in series with the output.
Sort of defeats the object of the buffer.
then what should i do?
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