Most stereo recordings are not directly suitable for listening with headphones. This circuit modifies the stereo recording in a way that compensates for what listening with headphones doesn't allow. The justification for cross-feed and equalization is fully explained in the attached article.
Below is a photo of the circuit constructed on strip board. As you can see, the circuit is not overly complex and building it on strip board was not too time consuming. Layout had to be compact as I intend to add two output stages with output current capability to drive a headphone.
Parts List (see the schematic diagram, Fig. 7, in the attached article)
Op Amps
U1, U3,U4, U6: RC4558 dual op amp
U2, U5: LM301
Resistors, 1/4W 5% carbon film
R1-10k
R2-4k7
R3-1k8
R4-5k6
R5-15k
R6-15k
R7-4k7
R8-4k7
R9-15k
R10-10k
R11-330R
R12-15k
R13-33k
R14-15k
R15-10k
R16-4k7
R17-1k8
R18-5k6
R19-15k
R20-4k7
R21-4k7
R22-15k
R23-10k
R24-330R
R25-15k
R26-33k
CAPACITORS, polyester film 10% unless noted otherwise
C1-18nF
C2-150pF polystyrene
C3-18nF
C4-390nF
C5-390nF
C6-6n8
C7-18nF
C8-150pF polystyrene
C9-18nF
C10-390nF
C11-390nF
C12-6n8
This is intended to be connected between (in cascade) a line level stereo source such as a CD player and an amplifier capable of driving headphones. Please see the attached article for the schematic diagram of the circuit (Fig. 7) and a fairly extensive description of the derivation (justification) of the design.
-Pete
Below is a photo of the circuit constructed on strip board. As you can see, the circuit is not overly complex and building it on strip board was not too time consuming. Layout had to be compact as I intend to add two output stages with output current capability to drive a headphone.
Parts List (see the schematic diagram, Fig. 7, in the attached article)
Op Amps
U1, U3,U4, U6: RC4558 dual op amp
U2, U5: LM301
Resistors, 1/4W 5% carbon film
R1-10k
R2-4k7
R3-1k8
R4-5k6
R5-15k
R6-15k
R7-4k7
R8-4k7
R9-15k
R10-10k
R11-330R
R12-15k
R13-33k
R14-15k
R15-10k
R16-4k7
R17-1k8
R18-5k6
R19-15k
R20-4k7
R21-4k7
R22-15k
R23-10k
R24-330R
R25-15k
R26-33k
CAPACITORS, polyester film 10% unless noted otherwise
C1-18nF
C2-150pF polystyrene
C3-18nF
C4-390nF
C5-390nF
C6-6n8
C7-18nF
C8-150pF polystyrene
C9-18nF
C10-390nF
C11-390nF
C12-6n8
This is intended to be connected between (in cascade) a line level stereo source such as a CD player and an amplifier capable of driving headphones. Please see the attached article for the schematic diagram of the circuit (Fig. 7) and a fairly extensive description of the derivation (justification) of the design.
-Pete
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