0 LED MONO VU METER K4304 g or r existin u o y to adout isual re quipment.
Features & Specifications Features: For instant visualization of audio signal levels. Easy hook up to a LINE level ( LOW input) signal source. For use with mixing panels, amplifiers, CD players, radio’s, ... A special input (HIGH INPUT) is provided, which allows direct connection to a SPEAKER output . DOT or BAR display mode selectable to suit your application. Attractive display window supplied, which can be used both horizontal as vertical.
Assembly hints 1. Assembly (Skipping this can lead to troubles ! ) Ok, so we have your attention. These hints will help you to make this project successful. Read them carefully. 1.1 Make sure you have the right tools: A good quality soldering iron (25-40W) with a small tip. Wipe it often on a wet sponge or cloth, to keep it clean; then apply solder to the tip, to give it a wet look. This is called ‘thinning’ and will protect the tip, and enables you to make good connections.
Assembly hints 1.
Construction 1. Jumper wires 2. Diodes. Watch the polarity ! 5. Resistors J1 R... D... CATHODE D1 : 1N4148 D2 : 1N4148 J2, mount for BAR mode, do not mount for DOT mode. ZD... +1 0d B -1 +2 +3 CATHODE : : : : : : : 47K 47K 330 10K 10K 2K2 470K (4 - 7 - 3 - B) (4 - 7 - 3 - B) (3 - 3 - 1 - B) (1 - 0 - 3 - B) (1 - 0 - 3 - B) (2 - 2 - 2 - B) (4 - 7 - 4 - B) 6. IC sockets. Watch the position of the notch! 4. Diode.
Construction 7. Capacitors. 10. 1W resistor R... C... 2mm C1 : 220nF (224) C2 : 220nF (224) R8 : 68 8. Trim potentiometer (6 - 8 - 0 - B ) 11. IC’s. Watch the polarity ! RV1 : 220K (Sensitivity) 9. Electrolytic Capacitors. Watch the polarity ! C3 : 47µF C4 : 47µF C5 : 47µF 6 C...
Construction 12. MOUNT THE LEDs (Check the polarity) Remark: Depending on your application, these LED’s can be mounted perpendicular or parallel (see also points 13 and 14): LD1 : green LD2 : green LD3 : green LD5 : green LD4 : green LD6 : green LD7 : green LD8 : yellow LD9 : yellow LD10 : red LD...
Parallel mounting 13. PARALLEL MOUNTING (optional) 7 (A) Make the holes in the housing or panel (fig.1.0) : 4.5 Ø3.5 Fig. 1.0 6mm M3 COUNTERSUNK-HEAD BOLT 2...3mm FRONTPANEL LOCK WASHER FRONTPANEL 10mm M3 SPACER LOCK WASHER 10mm M3 SPACER 8 Fig. 2.0 52 60 (B) Mount the suitable spacers (fig. 2.
Parallel mounting (C) Mount the PCB onto the spacers (fig 3.0) : 6mm M3 COUNTERSUNK-HEAD BOLT 2...3mm FRONTPANEL LOCK WASHER 10mm M3 SPACER PCB 4mm M3 BOLT 4mm M3 BOLT Fig. 3.
Perpendicular mounting 14. PERPENDICULAR MOUNTING (optional) (A) Make or search for a suitable bracket : Fig. 4.0 10mm M3 COUNTERSUNK-HEAD BOLT 2...3mm FRONTPANEL FRONTPANEL LOCK WASHER M3 NUT BRACKET BRACKET LOCK WASHER M3 NUT 10 Fig. 5.0 (B) Make the holes in the housing or panel and mount the bracket (fig. 5.
Perpendicular mounting (C) Mount the PCB with spacers onto the bracket (fig. 6.0) : M3 NUT LOCK WASHER FRONTPANEL 15mm SPACER 20mm M3 BOLT BRACKET 2...3mm FRONTPANEL SOLDER SIDE BRACKET PCB M3 NUT LOCK WASHER 20mm M3 BOLT 15mm SPACER Fig. 6.
Connection 15. CONNECTION TO A SUITABLE SIGNAL Connecting to a line level output (tuner, preamp, cd player… ) and connecting a power supply from 10 to 15VDC / 110mA max.. HIGH IN LOW IN TAPE OUT + FROM AUDIO AMPLIFIER K4304 1N4007 + 12V/150mA 1000uF/25V MAINS + 10...15VDC POWER SUPPLY 12V/150mA 1N4007 12V/150mA MAINS + 1000uF/25V Fig. 7.0 Connect the unit to a suitable supply voltage between 10VDC and 15VDC, this can also be a standard DC adapter.
Connection 16. CONNECTION TO A SPEAKER OUPUT Connecting to a speaker level output and connecting a power supply from 10 to 15VDC / 110mA max. INPUT (0) SPEAKER OUT + HIGH IN LOW IN - + K4304 FROM POWER AMPLIFIER 1N4007 12V/150mA + 1000uF/25V MAINS 12V/150mA POWER SUPPLY 1N4007 MAINS + 10...15VDC 12V/150mA + 1000uF/25V Fig. 8.0 Connect the unit to a suitable supply voltage between 10VDC and 15VDC, this can also be a standard DC adapter.
Connection 17. CONNECTION TO A CAR RADIO Connecting to a speaker output from a regular car radio. SPEAKER OUT + HIGH IN LOW IN - + +12V ANTENNE POWER OUT CAR RADIO K4304 Fig. 9.0 The 12VDC car battery power or car radio antenna output can be used to supply the VU meter. REMARK: Do not connect the unit to a high power car booster or car stereo, this equipment uses isolated ground connection.
PCB & Diagram 18. PCB LAYOUT 19. DIAGRAM J1 CLOSED = BAR MODE J1 OPEN= DOT MODE R7 HIGH IN 470K R1 +V C1 RV1 SENSITIVITY LOW IN 47K J1 D1 +V 2 6 IC1 +1dB 12 7 330 D2 SIG 5 4 UA741 13 R4 C3 10K 47u RLO IC2 14 -3dB 15 6V2 6 C4 47u + GND 17 ADJ +V C5 47u C2 220n -10dB 8 18 R5 10K LD2 GREEN -20dB 1 2 LD3 GREEN 2K2 D3 10...
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