Aion Electronics L5 Preamp Manual - Halaman 6
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Halaman Cetak
Parts
Capacitors, cont.
C50
100n
C51
220uF/35V
C52
220uF/35V
C53
220uF/35V
C54
220uF/35V
C55
220uF/35V
C56
220uF/35V
C57
100n
C58
100n
C59
22uF/25V
C60
22uF/25V
CX1
jumper
Semiconductors
Q1
2N5457
Q2
2N3906
Q3
MPSA13
QX1, QX2
2N5088
D1–2, D6–11
1N4004
D4, D5
1N914
DX1, DX2
1N4004
CH1, CH2
5MM LED
BYPASS
5MM LED
COMP
5MM LED
Tweaked value: The original amps had two input jacks per channel, one for each of the "Lo" and "Hi"
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settings. I combined these into one switch using parallel resistors, so the values have been modified but it is
electrically identical.
Optional. I included these three resistors as an experiment to see if the inevitable LED switch noise could be
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cut down by leaving a large resistor in place so there is a small but constant current going through it. It might
not have much effect but you can try it if you want.
Tonestack experimentation: I included this capacitor in case you wanted to experiment with modifying the
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tonestack. In a standard F/M/V tonestack, there's a cap here, but since the values have a changed by a factor
of five, the cap is no longer necessary. For a stock unit, you'll want to jumper this.
Alternate value: 2.5kA pots are very difficult to find. 2k will work fine here as an alternate value.
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Substitute single op-amp: The LF356N was the quietest single op-amp available in 1978, but there are
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much better ones available today. You might experiment with an OPA134, the single version of the OPA2134.
Substitute dual op-amp: The RC4558 is a fine op amp, but again, there are much better ones available
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today. Tou could substitute it with a lower-noise dual op amp such as the NJM2068, NE5532 or OPA2134.
L5 PREAMP
Potentiometers
MLCC
Bass 1
Treble 1
Bass 2
Mid Freq
MLCC
Treble 2
MLCC
Multifilter
Comp Level
Master
3
Comp Trim
Dist Trim
Bright 1
Bright 2
Vol 1
2.5kA
4
50kA
Mid 1
2.5kA
4
50kA
Vol 2
25kA
25kB
Mid 2
25kB
100kC dual
25kB
25kA
50kC
25kA
20k
(3362P)
20k
(3362P)
Switches
Hi/Lo
SPDT
SPDT
SPDT
Comp
SPDT
ICs
IC1
LF356N
5
IC2
LM741P
IC4
RC4558P
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IC5
RC4558P
IC6
RC4558P
IC7
RC4558P
IC8
RC4558P
IC9
RC4558P
IC10
CA3080
IC11
CA3080
IC12
RC4558P
IC13
LM741P
RG1
MC7815
RG2
MC7915
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