52 Board B

Monitor TP-5 (square wave output) with an oscilloscope. 3. Adjust the VCO 1 (or VCO 2) Coarse Frequency Slider to display exactly 1 complete cycle. 4. Adjust the 50 PULSE WIDTH trimmer until waveform duty cycle is exactly square (50 ). 1. Monitor TP-5 in VCO 1 (or VCO 2) with an oscilloscope or a frequency counter. 2. Put the VCO 1 (or VCO 2) Coarse Frequency Slider DOWN fully. 3. Put the VCO 1 (or VCO 2) Fine Tune Slider exactly in the MIDDLE. 5. Adjust the VCO CAL trimmer for a 50 msec,...

Arp Avatar Repair

3.3.1 VOLTAGE CONTROLLED FILTER (VCF) Audio signals from the VCF are processed by the high pass filter (C3, R13 and R74) and connected to the noninverting input of Z2. Z2 is an operational transconductance amplifier (OTA) whose gain is a function of the current signal supplied to pin 5. Control voltages from the two envelope generators and the VCA gain slider are connected to Q1 which supplies current to the OTA. R70, the control reject trimmer, balances the inputs of the OTA to minimize the...

21General

The Avatar's Extraction CV circuitry is divided into two basic sections E and E' Boards, and D and D' Boards. The E E' Boards contain the analog extraction portion of the instrument. Six audio signals from the ARP Hex Pickup are supplied to the E Board. The output is an extracted pulse wave at the frequency of the last string plucked. This signal is only gated out when the E E' circuitry is sure the signal is valid. The D D' Boards accept the extracted pulse wave from the E E' Boards and...

23 D D Boards

Hexaphonic Pickup

Boards D and D' accept a clean pulse wave from the E' Board, store it in memory, and then produce a control voltage to drive the synthesizer portion of the instrument. The memory feature of the circuit is used to produce continuously a valid control voltage even in the absence of a pulse on the input. The memory feature is also useful for masking the flatting effect caused by the release of a fretted string and other pitch inconsistencies typical of guitar signals which would otherwise cause...

String Sensitivity Trimmers Test Set Up Patch

Mot Passe Sony Vpl Es2

ALL SLIDERS AND SWITCHES NOT ILLUSTRATED SHOULD BE ALL THE WAY DOWN. - ' I ---' ' r ffiV 1 III Il 1 , ' gt . . .V. -. . ' . gipplp - ATE OUT ATE M Tfi OH T AJO CATES S' fJAL FLOiU A TC 80ARD . ' ., - . SEMH SH TCH COMMECT OA S E BOTTOM LEFT OF DPAW AJ . AVATAR MODEL 2223 INTERCONNECTION DIAGRAM E38 GATE Di D, De JlA-12 JlA-ll JIA'I JlA-1 1. uuless otheevoist speof fc '. all reststoe. val oes gt m ohv s all capaotoc values ape vm p piccfafcads' 12 ' o covjve gt 4t oki osed fdp suppl-r volta e...

Assembly Board B

Arp Avatar Cable

RED NUMBERS INDICATE BOARD - TO - BOARD CONNECTIONS. SEE PAGE 28 FOR FURTHER EXPLANATION. . UA L amp 5S OTHEWSe srecirieb-ALL S STO.C AJ O HS lu. lt I IPACI gt -QPS stet v uf CP ptCOFAeAbi S. H' H ST eer es cz l1 j3d , r i, 2 21 3. co v i gt y r o v L sab fou slipplv voltage RED NUMBERS INDICATE BOARD - TO - BOARD CONNECTIONS. SEE PAGE 28 FOR FURTHER EXPLANATION. MOTES'. I. UklLESS DTHEtWSE 5PEC FIEty. V-- PICOFARADS ALL DlODES ARE IM4I4S Z. HIGHEST REF DEV.C73, CTJ2S, J lt iE.,Vll, Q4-, 1222...

Avatar Model 2223 Wiring Diagram Power Supply

Assy Model 76205

AVATAR MODEL 2223 ASSEMBLY POWER SUPPLY ' AMP DUAL ' AMP QUAD NORTON IC QUAD COMPARATOR C OP AMP FET C 5V REGULATOR C 18-STAGE STATIC SHIFT REG C CMOS PAIR PLUS INVERTER IC DUAL 'D' FLIP FLOP SET RESET IC DUAL 4-STAGE STATIC SH REG IC GATE QUAD EXCLUSIVE-OR D-TO-DEC. DECODE DRIVER POT SLIDE AUDIO 1M, POT SLIDE 100K AUDIO CAP TANT 1UF 35V 20 CAP TANT 10UF 35V 20 SWITCH SLIDE DPDT SWITCH SLIDE DP3T SW MOMENTARY CONTACT PB 3-PIN CONNECTOR RECP SOCKET DUAL IN LINE 16-PIN CABLE 16-PIN REFERENCE ARP...

Foot Switch Jacks

Arp Foot Pedal Expression

ARP Foot Switch V4 stereo jack, tip and ring normally closed ARP Filter Foot Pedal stereo jack to 100K and taper potentiometer in pedal Enables triggers from Trigger Generator Circuit to enter Trigger Select Circuit Allows user to select which of the six strings can control the synthesizer. Routes either pink noise or guitar signal to Board C. Allows the guitar signal straight or fuzz to be processed through the VCF, in addition to the VCOs. Adds a lag or delay to the string control voltage....

11 Introduction

The AVATAR is divided into two sections Synthesizer and Pitch Extractor CV Generator. The Synthesizer section is like the ARP Odyssey in fact, the AVATAR and Odyssey use several of the same printed circuit boards . It consists of two voltage controlled oscillators, a voltage controlled filter, a voltage controlled amplifier, two envelope generators ADSR and AR , a low frequency oscillator, and a sample and hold circuit. As with standard keyboard synthesizers, the synthesizer requires a 1 V...