M412 — Multi-frequency Oscilator

The M412 multi-frequency reference oscillator is designed to be incorporated within a system and to provide selected frequencies with stable output amplitude at Iine and microphone levels Thus, the performance of an audio console r complete system may be rapidly assessed prior to operation: In addition, the reference tone provides a convenient method for multi-track alignment or set-up in the recording mode.

FEATURES: 10 selectable frequencies with balanced output 3 outputs 8dBm direct, 8dBm and ~6OdBm via audio switch The compact M412 is compatible with other Ward-Beck modular component designs for audio console and systems applications. Unit versatility is enhanced by the simple power requirement of 24Vdc, unregulated, making the M412 suitable for use in any system where auxiliary 24V Iamp or relay voltage exists Low distortion less than 0.2% The state-of-the-art circuitry utilizes operational amplifiers throughout, combined with the superior performance of unique FET AGC system to produce excellent amplitude stability between selected frequencies Actively balanced operational amplifiers present & balanced configuration at the utput: A balanced output resistive isolation network provides 8dBm 600 ohms direct , 8dBm 600 ohms and ~6OdBm 150 ohms via an alternate-action output switch_ Stable output better than t 0.2dB amplitude stability Operates from readily available 24Vdc Ten selectable frequencies are included in the M412 module; 20Hz , 30Hz , S0Hz _ 1OOHz , 500Hz, IkHz, SkHz , 10kHz _ 15kHz, and 20kHz.

As an option, an output level control may be accommodated directly on the front panel escutcheon. front panel status light illuminates to indicate the presence of tone when the alternate-action pushbutton is depressed. Operational amplifier design with FET AGC

The M412 multi-frequency reference oscillator is designed to be incorporated within a system and to provide selected frequencies with stable output amplitude at Iine and microphone levels: Thus, the performance Of an audio console or complete system may be rapidly assessed prior t0 operation: In addition_ the reference tone provides a convenient method for multi-track alignment Or set-up in the recording mode FEATURES: 10 selectable frequencies with balanced output 3 outputs 8dBm direct, 8dBm and 6OdBm via audio switch The compact M412 is compatible with other Ward-Beck modular component designs for audio console and systems applications.

Unit versatility is enhanced by the simple power requirement of 24Vdc, unregulated, making the M412 suitable for use in any system where auxiliary 24V Iamp or relay voltage exists Low distortion less than 0.2% The state-of-the-art circuitry utilizes operational ampli fiers throughout, combined with the superior performance of a unique FET AGC system to produce excellent amplitude stability between selected frequencies.

Actively balanced operational amplifiers present & balanced configuration at the output balanced output resistive isolation network provides 8dBm 600 ohms direct, 8dBm 600 ohms and 6OdBm 150 ohms via an alternate-action output switch_ Stable output better than * 0.2dB amplitude stability Operates from readily available 24Vdc Ten selectable frequencies are included in the M412 module; 20Hz 30Hz , 50Hz , 1OOHz , 500Hz, 1kHz, 5kHz, 1OkHz, 15kHz, and 20kHz As an option, an output level control may be accommodated directly on the front panel escutcheon.

A front panel status light illuminates t0 indicate the presence of tone when the alternate-action pushbutton is depressed_ Operational amplifier design with FET AGC

Fhe MA12 multi trexjuenev relerence Oscillator (lesigried I0 be incOpuurated sithin system and provide celected frequericics with siahle OUtFJUI amplitude Mnoand micropnone Fs ay perfon!alce Fnc= Cansnle cornplete systern may he ranidly &s5essd prior OHt Fation In dodition; Ine reterence tone provides convenient method t0F muli-track iwinment Et-up in the recording moce FEATURES; 10 selectable Ircqucricies with Jlanced cutput 3 outputs BdBm direct, 8dBm and GOdBm vin dudic swritch Tne comnact M412 IS comnatible with other WNard -Rec' moduilar conponent Oesinn: aucia console and Systems applications Unit versatility enhanced by the simple nower requirerent ot Z4Vdc; unreulated , making the M412 suitable uny svsiem where auxiliary 24v Iamn Teiav VOITBoe EXStS Low distortion less than Tnc slale-ofs Curuitry utilizes operational amplitiers throughoui; conbined with th SuperIO pu {cmianc unque FET AGC ~sle pruxuce pcelleni amplitudle slability Detweeri selecied irequeticies Activelv balaliled upuralional artiplifie uzuN palanced conliguralion output; balariced Gupl resistive isolation network novide= sBin 60O onms direct #Bm 600 ohrs ~6UdBm 1S0) onms vIa alernaie Kactinn OUM suvitch Stable (UlgMal Galter chan ZdB ampliiude stability Operates from readily available AVdc Ten slectablu trecuencies Are inclucled the M412 moduie; ZOHV' , 30H, , 50HZ .

TOOHz; 5OCHZ IkHzSkhz, iokhz, I5k17 n 2Uklz 4s an option; outpur level COntro may bC #Ccommodaled directly 0n (e Tront panel CJCU tcheon: Front punc slutls Wight illuminates indicate the Crosence ot tone when (he alternate-action Fushbutton Canassem Orerational amplifier clesiJn wih FET AGC

FREQUENCY Selectable: 20Hz , 30Hz , S0Hz , 1OOHz , S00Hz , 1kHz , SkHz, 1OkHz, 15kHz , 20kHz OUTPUT LEVELIIMPEDANCE a) + 8dBm 600 ohms direct b)+ 8dBm 600 ohms via switch c) ~6OdBm 150 ohms via switch TOTAL HARMONIC DISTORTION Less than 0.2% 20Hz to 20kHz FREQUENCY ACCURACY /STABILITY Within + 5% AMPLITUDE STABILITY Within + 0.2dB for ay selected frequency POWER REQUIREMENTS 24 to 36 volts dc, unregulated 4OmA , less than Iv rms ripple AMBIENT TEMPERATURE 0"to 60'c DIMENSIONS 1.58W x 6.625L x 6D inches below panel WEIGHT Ib.

net ACCESSORIES: WARD-BECK SYSTEMS LTD_ WARD-BECK SYSTEMS INC 841 Progress Ave,Scarborough,Ont MH2x4 290 Larkin St;, Buffalo, New York 14210 Telephone: (416) 438-6550 Telex: 06-23469 WBS

FREQUENCY Selectable: 20Hz , 30Hz , S0Hz , 1OOHz , S00Hz , 1kHz , SkHz, 1OkHz, 15kHz , 20kHz OUTPUT LEVELIIMPEDANCE a) + 8dBm 600 ohms direct b)+ 8dBm 600 ohms via switch c) ~6OdBm 150 ohms via switch TOTAL HARMONIC DISTORTION Less than 0.2% 20Hz to 20kHz FREQUENCY ACCURACY /STABILITY Within + 5% AMPLITUDE STABILITY Within * 0.2dB for any selected frequency POWER REQUIREMENTS 24 to 36 volts dc, unregulated 4OmA , less than Iv rms ripple AMBIENT TEMPERATURE 0"to 60'c DIMENSIONS 1.58W 6.625L x 6D inches below panel WEIGHT Ib.

net ACCESSORIES: WARD-BECK SYSTEMS LTD_ WARD-BECK SYSTEMS INC 841 Progress Ave-Scarborough,Ont MH2x4 290 Larkin St;, Buffalo; New York 14210 Telephone: (416) 438-6550 Telex: 06-23469 WBS

FREQUENCY Selectable: 20Hz, 3Hz , SOHz, IOOHz , SO0Hz , IkHz, SkHz. IOkHz; ISkHz, 20kHz OUTPUT LEVELIIMPEDANCE al + 8dBm 600 ohms direct bl+ 8dBm 600 hms via switch 60dBm 150 ohms via switch TOTAL HARMONIC DISTORTION Less than 0.290 20Hz t0 20kHZ FREQUENCY ACCURACY /STABILITY Within AMPLITUDE STABILITY Within 0.2dB far any selected frequency POWER REQUIREMENTS 24 to 36 volts dc, unregulated 4DmA , [namtvrmS rpple AMBIENT TEMPERATURE 0" to 60'c DIMENSIONS 1.58w _ -625L 6D inches below panel WEIGHT Ib: net ACCESSORIES: WARD-BECK SYSTEMS LTD WARD-BECK SYSTEMS INC_ 841Frorre Avu-ScurborouhOntMh2x4 LuTAO Eutaao Man 14270 Telephore (418 4306550 HA: 05-23469 4PSDY WBS

R21 This resistor controls the amount of AGc correction provided by Ql and, therefore, is adjusted to give the best amplitude stability with different frequency selections NOTE: There is compromise adjustment between amplitude stability and harmonic distortion R29 With the frequency control set to 20 Hz , adjust for minimum distortion. The adjustment is made in small increments while obgerving the digtortion at the oscillator output