2 x 15 LED STEREO VU-METER

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Franklin Little
5 years ago
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1 Total solder points: 271 Difficulty level: beginner advanced K x 15 LED STEREO VU-METER For visualization of audio signals. Can be used with Velleman mixing panel. Use with mixing panels, amplifiers, car audio systems Easily connects to the line-level output (LOW INPUT) from any tape deck, stereo system, or CD player. A special input (HIGH INPUT) is provided, so that the unit can directly be connected to the speaker output of most systems*. To make it universal, the readout can be set as DOT or BAR indication. The supplied display window for vertical or horizontal mounting, makes the unit very attractive. If wanted, the unit can be calibrated by the means of a trim potentiometer. *NOT SUITED FOR CONNECTION TO HIGH POWER CAR STEREO SYSTEM Specifications Bar or dot readout. Scale: -23dB to 5dB, 15 LED s per channel. db-linear division from -4 to 5dB (1dB per led). Systematically growing steps below -4dB. Accuracy: ±0.5dB (1KHz). Frequency range: 20Hz to 30KHz (-3dB). Three different LED colors: green, orange and red. Adjustable input sensitivity: 150mV to 5Vrms Low input 1.5V to 50Vrms High input Input impedance: 47K Low input / 470K High input Power supply: 12 to 15VDC / 300mA Dimensions: 150 x 57mm modifications reserved PARTLIST H4306P-ED1

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ASSEMBLY STEPS Required tools to assemble the kit: Use a small soldering iron of max. 40W. Use thin (1mm) solder, do not use any flux. Use a small cutter to trim the excess wires. 1. 2. 3. 4. Mount the components against the PCB surface and carefully solder the leads in place.

3 ASSEMBLY STEPS Required tools to assemble the kit: Use a small soldering iron of max. 40W. Use thin (1mm) solder, do not use any flux. Use a small cutter to trim the excess wires Mount the components against the PCB surface and carefully solder the leads in place. Obtain cone- shaped, shiny soldered joints by heating up the component leads sufficiently. This solder joint gives a bad connection. Trim the excess wires up to the level of the solder Careless assembly will certainly lead to troubles. Insert the part, oriented correctly, into its correct holes on the PCB. Mount the components in the correct order as stated in this manual. The component values in the diagram are for reference only. The values in this partlist are correct and must be followed. Use the boxes to tick off your progress. Before starting to build, also read the general guidelines 3

4 Assembly Mount all components onto the PC board. 1. JUMPERS 2. MODE SELECTION JUMPERS J1 J2 J3 J4 J5 J6 J7 J8 J9 J10 J11 For BAR readout mount the JB jumpers or for DOT readout mount the JD jumpers. BAR DOT Left dB Right Left dB Right JB1 JD1 JB2 JD2 JB3 JB4 4

5 3. DIODES (Check the polarity!) 5. 1% METALFILM RESISTORS CATHODE D... R... D1: 1N4148 D2: 1N4148 D3: 1N4148 D4: 1N4148 D5: 1N4148 D6: 1N4148 D7: 1N4148 D8: 1N4148 D9: 1N N ZENER DIODE (Check the polarity!) R1: 3K ( ) R2: 3K9 ( ) R3: 3K ( ) R4: 3K9 ( ) 6. ¼W RESISTORS R... CATHODE ZD1: 6V2 ZD... R5: 470K ( B) R6: 47K ( B) R7: 47K ( B) R8: 470K ( B) R9: 47K ( B) R10: 47K ( B) R11: 2K2 ( B) R12: 18K ( B) R13: 18K ( B) R14: 2K2 ( B) R15: 1K ( B) R16: 1K ( B) R17: 2K2 ( B) R18: 2K2 ( B) R19: 2K2 ( B) R20: 330 ( B) 5

6 7. IC SOCKETS (Check the position of the notch!) 9. 1W RESISTORS R... 1 IC... 2mm IC1: 8P IC2: 8P IC3: 18P IC4: 18P IC5: 18P IC6: 18P 8. RESISTOR TRIMMERS R21: 47 ( B) R22: 47 ( B) 10. CAPACITORS C... RV... C1: 220n (224 - µ22) C2: 220n (224 - µ22) C3: 220n (224 - µ22) RV1: 250K (220K) RV2: 250K (220K) 6

7 11. ELECTROLYTIC CAPACITOR (Check the polarity!) C4: 470µ C5: 47µ C6: 47µ C7: 470µ C LED s (Check the polarity!) (Mount the LED s at correct height) COLOR = LD12: green (5) LD13: green (5) LD14: green (5) LD15: green (5) LD16: green (5) LD17: green (5) LD18: green (5) LD19: green (5) LD20: green (5) LD21: yellow (4) LD22: yellow (4) LD23: yellow (4) LD24: yellow (4) LD25: red (2) LD26: red (2) LD27: red (2) LD28: red (2) LD29: red (2) LD30: red (2) 13. IC s (Check the position of the notch!) LD... 1 CATHODE 13mm PIN 1 IC... LD1: green (5) LD2: green (5) LD3: green (5) LD4: green (5) LD5: green (5) LD6: green (5) LD7: green (5) LD8: green (5) LD9: green (5) LD10: green (5) LD11: green (5) IC1: 741 IC2: 741 IC3: LM3916 IC4: LM3916 IC5: LM3916 IC6: LM3916 7

8 Mount the unit in a suitable housing or on a suitable panel 14. DRILL PATTERN FRONT PANEL Ø Mount spacers onto the front panel 6mm M3 COUNTERSUNK-HEAD BOLT 10mm M3 SPACER LOCK WASHER 6mm M3 COUNTERSUNK-HEAD BOLT 2...3mm FRONTPANEL SHAKEPROOF WASHER 10mm M3 SPACER 8

9 16. Mount the PCB onto the front panel 4mm M3 BOLT 6mm M3 COUNTERSUNK-HEAD BOLT 2...3mm FRONTPANEL SHAKEPROOF WASHER 10mm M3 SPACER PCB 4mm M3 BOLT 9

10 Connect the unit to a suitable signal, this can be line level (LOW input) 17. Connecting to a line level output of a preamplifier and connecting a power supply from 12 to 15VDC / 300mA TAPE L OUT R FROM AUDIO AMPLIFIER HI LEFT LO LO HI RIGHT V K4306 MAINS MAINS 1N V/300mA 12V/300mA 1N V/300mA 1000uF/25V 1000uF/25V VDC POWER SUPPLY Connect the unit to a suitable supply voltage between 12VDC and 15VDC, this can be a standard DC adapter. You can also build your own power supply, see diagram. Use a 2x12V transformer, two rectifier diodes and a electrolytic capacitor or use a single 12V transformer with a bridge rectifier and a electrolytic capacitor. 10

11 Connect to a speaker level (HIGH input) 18. Connecting to a speaker level output and connecting a power supply from 12 to 15VDC / 300mA L LEFT SPEAKER L- INPUT (0) R- RIGHT SPEAKER R FROM POWER AMPLIFIER HI LEFT LO LO HI RIGHT V K4306 MAINS MAINS 1N V/300mA 12V/300mA 1N V/300mA 1000uF/25V 1000uF/25V VDC POWER SUPPLY Connect the unit to a suitable supply voltage between 12VDC and 15VDC, this can be a standard DC adapter. You can also build your own power supply, see diagram. Use a 2x12V transformer, two rectifier diodes and a electrolytic capacitor or use a single 12V transformer with a bridge rectifier and a electrolytic capacitor. 11

12 19. Connecting to a car radio LEFT SPEAKER R- RIGHT SPEAKER R CAR RADIO L L- 12V ANTENNE POWER OUT HI LO LEFT LO HI RIGHT V K4306 REMARK: Do not connect the unit to a high power car booster or car stereo, this equipment uses isolated ground connection. The connection to this kind of amplifier can cause permanent damage to the amplifier or car radio! 20. Connecting into Velleman mixing panel K4306 RIGHT V LO LEFT LO V VU R OUT L L R -V V EFF MON REC OUT VELLEMAN K2664 Adjust the unit sensitivity according to your satisfactions by means of the trim potentiometer RV1 and RV2. 12

13 21. PCB 13

K LED MONO VU METER

K LED MONO VU METER Total solder points: 93 Difficulty level: Beginner 1 2 3 4 5 Advanced K4304 10 LED MONO VU METER For instant visualization of audio signal levels. Easy hook up to a LINE level ( LOW input) signal source.