K8094 ILLUSTRATED ILLU LLU LUSTRA LU STRA ATED TED ASS ASSEMBLY ASSE MBLY BLY LY MAN M MANUAL ANUAL AL H8094IP’ H H8094IP’1 8 P’’1 EXTENDED RECORD PLAYBACK KIT Allows you to record and play messages of up to 8 minutes long.
The K8094 allows you to record and play messages of up to 8 minutes long. Recording speed is continuously adjustable so that you can choose a perfect compromise between duration and sound quality. It also allows you to generate funny sound effects. Messages are retained in memory at power loss. The unit comes complete with microphone, line level in- and output and an output for a small speaker.
Leds and how to use them Leds feature a specific voltage drop, depending on type and colour. Check the datasheet for exact voltage drop and rated current ! Never connect leds in parallel How to Calculate the series resistor: Example: operate a red led (1.7V) on a 9Vdc source. Required led current for full brightness: 5mA (this can be found in the datasheet of the led) Supply voltage (V) - led voltage (V) required current (A) 9V - 1.7V 0.
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.
DO NOT BLINDLY FOLLOW THE ORDER OF THE COMPONENTS ONTO THE TAPE.
Construction 1 Resistors 4 IC-socket 8 Voltage regulator VR1 : UA78L05 R... VR... IC1 : 28p IC2 : 8p R1 ... R3 R4, R5 R6 R7 R8 R9 R10 : 4K7 : 1K : 100K : 47K : 390 : 10 : 10K (4 - 7 - 2 - B) (1 - 0 - 2 - B) (1 - 0 - 4 - B) (4 - 7 - 3 - B) (3 - 9 - 1 - B) (1 - 0 - 0 - B) (1 - 0 - 3 - B) 2 Ceramic Capacitor 5 Ceramic Capacitor 9 Pin-header c... C10 : 47nF 6 Trimmer JP1 : 2pins 10 Microphone MIC1 C1 ... C9 : 100nF 3 Diode (Check polarity!) D...
Construction 12 Board-to-wire connector 15 Terminal block Sampling Frequency SK2 : External control SK5 : 2p (speaker) 16 Vertical cinch connector 13 LEDs J SK3 : Line in SK4 : Line out COLOR= 2...5 Watch the polarity! 17 IC’s LD... Turn RV1 left to decrease the sample rate and increase the total recording time, turn it fully clockwise to decrease the total recording time. The shorter the recording time the higher the quality of the played message.
Basic connection diagram Basic connection diagram Light up when power supply is connected. + - - + (8ohm - 10% THD) 500mW Max. 12VDC 12V VDC Remove shunt when n inte internal ternal microphone is needed. ed ed. d. Tur Turn the “volume” trim trimmer into middle position. Turn the “sample frequency” requency”” trimmer into centre e position position.
Extended possibilities Record a message: 1. Keep button SW1 pressed to record. 2. Release button SW1 to end recording. Extended possibilities Optional: connect up to 5 external control buttons, relay contact or “open-collector” outputs Repeat this procedure to record a next message. Play latest recorded message: Briefly press button SW2 to play the latest recorded message.
PCB LD1 LD2 VR1 C16 C11 R4 R5 R6 SPEAKER C2 SW SK1 9-12VDC. 1.GND 2.Rec. 3.Play 4.Erase 5.Next 6.Reset - POWER Control: PLY/REC + C1 D1 SW4 NEXT. SW3 ERASE. C8 RV1 R8 RV2 C13 Sample freq. C9 P8094'1 LINE OUT. SW2 PLAY. SW1 RECORD. R7 LINE IN. C12 C10 IC2 C5 R9 SK2 1 C7 EXT. CONTROL C3 IC1 MIC MIC1 R3 C4 R2 1 Line F.T. C6 C14 Velleman N.V. R1 R10 Volume.
Diagram I SW SK2 external control C1 100n C16 220μ - GND GND GND GND VR1 UA78L05 D1 1N4007 + SK1 12DC REG.
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