Velleman K4021 Bedienungsanleitung Seite 16

- R9, 820 ohms (grey, red, brown)
- R10, 3K9 (orange, white, red)
- R12, 470 ohms (yellow, purple, brown)
- R13, 6K8 (blue, grey, red)
On one print mount the LEDs on the soldering side (for the right
channel) and, on the other print, mount the LEDs on the
component side (for the left channel).
Mount the print pins for LF, -V, GND and +V ON THE
COMPONENT SIDE of the print where the LEDs have been
mounted on the soldering side. Mount the print pins for LF, -V,
GND and +V ON THE SOLDERING SIDE of the print where the
LEDs have been mounted on the component side.
NOTE: Make sure that the LEDs are straight and square and have
one notch against the print. It is advisable to first solder one
connection for each LED, then to correct their position and finally
to solder the other connection. Watch the polarity! The shortest
LED connection corresponds to the THICK line of the print mark.
- LED 13 to LED 24, YELLOW LEDs
- LED 1 to LED 11, GREEN LEDs
- LED 12, RED LED
- LED 25 to LED 28, YELLOW LEDs
On both prints mount the ICs in their sockets:
IC1, type LF357 with its notch in the direction of the LEDs.
IC2 to IC4, type LM339 with their notches in the direction of the
LEDs.
Use as a bridge amplifier:
Mount the following resistors on one print:
- R1, 15 ohms (brown, green, black)
- R2, 6.8 ohms (blue, grey, gold)
- R3 and R4, 12 ohms (brown, red, black)
- R5, 22 ohms (red, red, black)
- R6 and R7, 39 ohms (orange, white, black)
- R8, 68 ohms (blue, grey, black)
H4021-ED1-16