Tone control pre-amp - Page 2

cwteoh · 18th January 2008, 05:38 AM

digi01,
There are cap attached at the signal input and signal output. what value is best to put? 0.47uF? or 1uF?

digi01 · 18th January 2008, 07:20 AM

i use 100n rifa for input,10uf elna for output.they are not the dedicated value.i just pick up handy

to huy5005,
its sound mid-hi,no hi-fi.its no problem play background music in living room a cup of tea

z

Bob Richards · 12th June 2011, 07:06 PM

Tone controls done well is a huge plus.

Frank Berry · 12th June 2011, 07:18 PM

I've built a similar preamp using the IC.
The performance is good but it doesn't have too much headroom.
2 volts will cause the chip to distort.
Still ... it does a good job for non-critical listening.

sofaspud · 12th June 2011, 07:58 PM

I've been using Rod Elliott's Project02 tone control with various op amps and am pleased with the performance. I have a LM1036 but haven't yet put it to use. If I remember the specs, it seemed a little noisy. What are you finding to be the limitations for this chip? What don't you like about it? Frank B, your comments made me dig up the datasheet, and max input voltage is shown as 1.6V typ with a Vcc of 12. I had planned to use mine with a LM1876 amp and thought it would be a decent match.

Frank Berry · 12th June 2011, 08:39 PM

It will work well but the Vcc is limited to 12 volts.
You may need to attenuate the level of the sources going to the input a little so as to avoid exceeding the maximum 1.6 volt input.
The IC is not bad. It's designed to attenuate the internal IC noise as the volume control is turned down. A nice feature.
My main objection to this IC is the input voltage limit. It's limited for obvious reasons ...
to eliminate the clipping of the audio when the bass and treble controls are at full boost.
On my preamp, I've added 6dB attenuator pads on the input of the chip and Opamps on the output to boost the level by 20dB. The Opamps are powered by + and - 15 volts.
I'd give the chip a try. You can adjust the values of the capacitors to achieve the low frequency and high frequency EQ turnover points that suit your needs.

sofaspud · 13th June 2011, 07:18 AM

I don't foresee my signal source running as hot as 1.6V, but your input attenuator idea seems like good insurance. Thanks for the info.

18th January 2008, 05:38 AM	#11
cwteoh diyAudio Member Join Date: Sep 2003 Location: Penang, Malaysia	digi01, There are cap attached at the signal input and signal output. what value is best to put? 0.47uF? or 1uF? __________________ Regards, C.W. Teoh

18th January 2008, 07:20 AM	#12
digi01 diyAudio Member Join Date: Mar 2003 Location: BEIJING	i use 100n rifa for input,10uf elna for output.they are not the dedicated value.i just pick up handy to huy5005, its sound mid-hi,no hi-fi.its no problem play background music in living room a cup of tea z __________________ 2010 DIY ALBUM UPDATED UCPv1(preamp) & DUAL(power supply)

12th June 2011, 07:58 PM	#15
sofaspud diyAudio Member Join Date: Nov 2005 Location: San Antonio TX	I've been using Rod Elliott's Project02 tone control with various op amps and am pleased with the performance. I have a LM1036 but haven't yet put it to use. If I remember the specs, it seemed a little noisy. What are you finding to be the limitations for this chip? What don't you like about it? Frank B, your comments made me dig up the datasheet, and max input voltage is shown as 1.6V typ with a Vcc of 12. I had planned to use mine with a LM1876 amp and thought it would be a decent match. __________________ It is error only, and not truth, that shrinks from enquiry. - Thomas Paine

12th June 2011, 08:39 PM	#16
Frank Berry diyAudio Member Join Date: Sep 2003 Location: Midland, Michigan	It will work well but the Vcc is limited to 12 volts. You may need to attenuate the level of the sources going to the input a little so as to avoid exceeding the maximum 1.6 volt input. The IC is not bad. It's designed to attenuate the internal IC noise as the volume control is turned down. A nice feature. My main objection to this IC is the input voltage limit. It's limited for obvious reasons ... to eliminate the clipping of the audio when the bass and treble controls are at full boost. On my preamp, I've added 6dB attenuator pads on the input of the chip and Opamps on the output to boost the level by 20dB. The Opamps are powered by + and - 15 volts. I'd give the chip a try. You can adjust the values of the capacitors to achieve the low frequency and high frequency EQ turnover points that suit your needs. __________________ Frank

13th June 2011, 07:18 AM	#17
sofaspud diyAudio Member Join Date: Nov 2005 Location: San Antonio TX	I don't foresee my signal source running as hot as 1.6V, but your input attenuator idea seems like good insurance. Thanks for the info. __________________ It is error only, and not truth, that shrinks from enquiry. - Thomas Paine


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12th June 2011, 07:06 PM	#13
Bob Richards diyAudio Member Join Date: Feb 2011 Location: Portland Oregon, USA	Tone controls done well is a huge plus.

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