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MAX626 5V V13 R23 2.2k U10 7 3 + 5 V+ OS2 6 LF356 OS1 2 - V1 4 R21 10000K MAX913CPA/MXM U14 0 R45 820 1 68p C21 U19A 0 150 R44 1 D1N4148 D28 1
-
1
V19 50V R42 47k 7 330n D02CZ13 M13 C17
V
U18 U15A 2 2 74HCT14
6
D30
+
-
0 IRF9640
+
V+ GND
150 R43 74HCT14 2 270p C20 180p
3 0
B
0
+
0 U12 7 3 + V+ OS2 + C9 330n LT1056OS1 V_SRC 2 - V4 0 100k R28 V12 5V 0 5 6 1 2.2k R27
1 2 + V+ Q 7 3 5 LE Q 8 V- GND 4 6 0 0
C19
+
V23 12V 0
L2 20uH C14 100n 0 IRF630 R41 47k D31 V20
+
B
R_LOAD 8
0 74HCT14 2 U17 U16A 2
-
6 7
-
C8
820p
V+ GND
M14 C18 330n D02CZ13
D27 D1N4148
3 0 MAX626
R22
47k
50V 0
The LT1056 is there as an impedance buffer
The MAX913 can be substitued with a MXL1016 or LT1016.
The first inverter, with the filte r on its input, is used to introduce a suitable delay (=keep switch frequency down )
This part is here still somewhat tentative - although it does reflect the current working assumption. Different alternative (old) ideas for this level-shifting and MOSFET driver part are kept in subfiles; amp30pow_a, amp30pow_b and so on...
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Copyright (c) 2001-2002 Johan Sörensen. Permission is granted to copy, distribute and/or modify this docum e n t under the terms of the GNU Free Documentation License, Versio n 1.1 or any later version published by the Free Software Foundatio n ; with the Invariant Sections being this copyright & license notice, with no Front-Cover Texts, and with no Back-Cover Texts.
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Sorensen Audio http://listen.to/audioexperiment
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The Sorensen Audio Experiment
Revision: 3-0 development
February 24, 2002 Page
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