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Old 13th January 2013, 06:52 PM   #31
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tkx ... I was looking at the same project the other day
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Old 13th January 2013, 07:13 PM   #32
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120 mA
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Old 13th January 2013, 08:27 PM   #33
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Do check how much takes every single amp.
Something is strange here.
The maximum I expected is 2.5mA DC + 1-1.5 mA(AC) per one amplifier.
12 mA are taken by R1,R4.

Quite conservative equation to determine wire diameter is
D=0.7*sqrt (I) .
For 150mA secondary coil you need in 0.28-0.3 mm wire,
Primary with central tap can be wound by same wire diameter.
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Old 13th January 2013, 08:34 PM   #34
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ok tkx .. I'll rewind the transformer
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Old 13th January 2013, 09:46 PM   #35
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I simulated a TL074 op-amp input buffer with gain of 1 on a 1Khz signwave with 2 v amplitude on a+-12V power supply and it drowse 12mA per op-amp

Last edited by adytzu22; 13th January 2013 at 09:50 PM.
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Old 14th January 2013, 08:04 AM   #36
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Typical dc consumption is 1.4 mA per amp.
I think it is just wrong numbers in model for LTSpice.

By the way, in order to get best noise performance R22 R34 resistors must be excluded.
Source impedance is unknown, but being assumed 600ohm,the feedback loop for U1 U2 U9 U15 must include resistor with nominal which is equal to the input resistor (you use in series with capacitor) plus 1.2kOhm.
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Old 14th January 2013, 10:07 AM   #37
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Model from Texas Instruments. Itís like there is mistyped
RP 3 4 2.143E3
instead
RP 3 4 2.143E4
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Old 16th January 2013, 06:13 PM   #38
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tkx that was the problem
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Old 16th January 2013, 11:28 PM   #39
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Yes, exists model for almost same chip( except audio ratings) -Motorola MC33001 and it has this value corrected.

The knowledge you are getting while building own converter is valuable thing but it will take time and resources before you can build reliable and efficient device.
You must know, disrelec.com they are represented in your country, and possible you have access to others suppliers.
DC/DC converters are not too expensive and very compact. There remains risk for 9 - 18volt converters because of the possibility of higher voltages in charging system.
I can suggest TMR 3-2422 WI, it is most efficient at 24V but still stable at 10-12V too.
17.5 EUR + taxes arenít too much for such cute piece of electronics.
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Old 17th January 2013, 10:47 AM   #40
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it's not about the price... I want to build it from scratch
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