Seems about right. TDA1524 output noise floor is given as about 100 µV in the datasheet, while for LM1036 it's 10 µV at minimum volume, which actually is an acceptable value for a hi-fi preamp (it's about what you'd expect from a 4558/4560/4565 class opamp at +16.5 dB). It looks like the NatSemi part implements a 2-stage volume control, which permits getting along with the relatively modest 80-ish dB dynamic range afforded by its circuitry.
Neither of the two is explicitly intended for hi-fi applications, though if in doubt I'd infinitely prefer the (more recent) LM1036. You just need to watch out for its limited input level handling and output level.
BTW - if you want 100 µV of output noise or less with a 26 dB power amp of 1.5 V input sensitivity, preamp output noise needs to be 5 µV or less - the final stage needs to have an SNR of almost 110 dB (or actually more, since preamps can often output up to 6-7 Vrms or even more - that puts us at 124 dB+). In case of the LM1036 the last stage seems to be good for about 100 dB.
Neither of the two is explicitly intended for hi-fi applications, though if in doubt I'd infinitely prefer the (more recent) LM1036. You just need to watch out for its limited input level handling and output level.
BTW - if you want 100 µV of output noise or less with a 26 dB power amp of 1.5 V input sensitivity, preamp output noise needs to be 5 µV or less - the final stage needs to have an SNR of almost 110 dB (or actually more, since preamps can often output up to 6-7 Vrms or even more - that puts us at 124 dB+). In case of the LM1036 the last stage seems to be good for about 100 dB.
I have 1036 based board from eBay, and I do get hiss and some strange behavior from it...
I tried to attenuate input from 2 to 1 Vrms, but still there is hiss at max volume...
I need to try better PSU though. What kind of PSU is driving yours?
I tried to attenuate input from 2 to 1 Vrms, but still there is hiss at max volume...
I need to try better PSU though. What kind of PSU is driving yours?
hi robertinjo,
please refer your power amp gain, maximum gain is below 33 no problem, but if u use stk41xx series it has 100 gain it makes hiss noise surely so u can use attenuator in your power amp input or reduce power amp gain.
please refer your power amp gain, maximum gain is below 33 no problem, but if u use stk41xx series it has 100 gain it makes hiss noise surely so u can use attenuator in your power amp input or reduce power amp gain.
Probably a dumb question, but can the 1036 be used with zero gain? I only need it for volume attenuation and possibly tone controls.
The LM1036 isn't an amplifier. The only gain it provides is frequency-selective via the tone controls.
The volume function can be thought of as a DC-controlled potentiometer.
The volume function can be thought of as a DC-controlled potentiometer.
The chip has inherent hiss. If it doesn't worry you and it is acceptable, there is no problem with it.
Hi,
i also use an LM1036 board from china (Aiyima LM1036 + NE5532) .
It works fine but the inherit hiss noise is to high. Someone any recomendation to reduce
this noise?
Maybe other preamps with small hiss?
Thx.
i also use an LM1036 board from china (Aiyima LM1036 + NE5532) .
It works fine but the inherit hiss noise is to high. Someone any recomendation to reduce
this noise?
Maybe other preamps with small hiss?
Thx.
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