POD5 — Dual Headset Amplifier

Nominal Operating Level +4dBu Headset Gain off to +10dB Talkback Gain -6dB to +6dB Max Output Level +24dB @ 600 Ω, +21dB @60Ω Frequency Response ± 0.2 dB, 20Hz to 20kHz S/N better than 80 dB, 20Hz to 20kHz Total Harmonic Distortion better than 0.05%, 20Hz to 20kHz Input Impedance greater than 20,000 Ω Stereo Separation better than 60dB, 20Hz to 20kHz Crosstalk better than 80dB, 20Hz to 20kHz

Power Requirements 115 VAC ,60Hz (available upon request) 230 VAC,50Hz Dimensions 8.69" wide x 1.73" high x 7.0" deep (221mm x 44mm x 178 mm) Weight 1.37 kg (3.01 lbs)

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FROM 110 VOLTS ac:

■ Two jumpers must be present, one connection Y1 to Y2, the other connection Y3 and Y4. This corresponds to JP2 and JP3 being in place.

FOR

FROM 220 VOLTS ac:

■ One jumper must be present, connecting Y2 and Y3. This corresponds to JP1 being in place.

Power Requirement: 110 or 220 volts ac, 60 or 50 Hz; 5 Watts. Ambient Temperature: 0o to 50o Celsius. Relative Humidity: 20 % to 90 %, non-condensing. Dimensions: 8.69" wide x 1.73" high x 7.00" deep (221 mm x 44 mm x 178 mm).

Sensitivity: 0 to +8 dBu for 0 dBu output. Frequency Response: ±0.2 dB, 20 Hz to 20 kHz. Noise: Greater than 65 dB below 0 dBu output. (20 Hz to 30 kHz). Total Harmonic Distortion: Less than 0.05%, 20 Hz to 20 kHz. Dynamic Range: Greater than 90 dB. Input Impedance: 20 000 ohms or greater, balanced. Source Impedance: 600 ohms or less, balanced. Output Impedance: Less than 100 ohms, unbalanced. Load Impedance: 600 ohms or greater, unbalanced.

Channel Separation: Greater than 55 dB, 20Hz to 20kHz.

Crosstalk: Greater than 60 dB, 20Hz to 20kHz.

Maximun Output: +24 dbm, 600 ohms, unbalanced.

Olla-Podrida

Operating Instructions

POD-5 DUAL HEADSET AMPLIFIER

Before operating this product, please read these instructions carefully

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METHODS

Notes: Set switches and controls in the following positions, unless specified otherwise. .Power Switch'ON' .Output Level Controls: Maximum .R16 and R5: Maximum .If unit has been outdoors, be sure that the temperature has been stabilized

➀ Common Mode Rejection Nulling

Objective: To Minimize transmission of common mode signals through the POD-1 balanced audio input to the unbalanced audio output.

Equipment: Audio Oscillator Audio Meter Test Cables

Procedure:

a) Inject a +4 dBu test signal into the left POD-1 balanced input (J1) at a frequency of 60Hz.

b) Measure a reference level on the unbalanced output. Note this level.

c) Remove one leg of the balanced audio signal. Connect the "hot pins" (2 and 3 on the XLR input) to the same unbalanced leg. Increase the generator level by +6dB to +10 dBu. While monitoring the unbalanced output (J3), trim potentiometer R5 for minimum signal. This should be 80 dB below the reference level noted previously.

d) Repeat the process for the right channel, adjusting R16 for minimum signal present at the Right unbalanced output (J4). ➁ Balanced to Unbalanced Frequency Response and Distortion Measurement

Objective: To verify the transparency of POD-1 to the audio spectrum when converting balanced audio to unbalanced audio.

Procedure:

a) Inject a 1 kHz, +0 dBu signal into the right balanced input (J2). Measure audio output at the right unbalanced output (J4). Adjust R21 (front panel accessible) for -10 dBu at J4. Change the input signal level to +8 dBu. Verify that a -10 dBu signal can be obtained at the output jack. Set the generator for +4 dBu input, and trim the output level for -10 dBu.

b) Sweep the signal generator through the audio spectrum. The signal should be within 0.2 dB of -10 dBu between 20 Hz and 20 kHz, with the output unterminated.

c) Measure the total harmonic distortion plus noise at several selected points across the spectrum. It should not exceed 0.02%, when measured at 10 dB above nominal signal level.

d) Turn the audio signal off. With a 600Ω termination on the balanced input, the output should read -80 dBu absolute, when passed through a 20 kHz low pass filter.

e) Repeat steps a through d for the left channel.

➂ Unbalanced to Balanced Frequency Response and Distortion Measurement

Objective: To verify the audio transparency of POD-1 when converting unbalanced audio to balanced audio.

Procedure:

a) Inject a 1 kHz, -10 dBu signal into the left unbalanced input (J5). Measure audio output at the left balanced output (P1). Adjust R27 (front panel accessible) for +0 dBu at P1. Adjust R27 and verify that a +8 dBu signal is obtainable at P1. Set R27 for +4 dBu output level for -10 dBu input level.

b) Sweep the signal generator through the audio spectrum. The signal should be within 0.2 dB of +4 dBu between 20 Hz and 20 kHz, with the output unterminated.

c) Measure the total harmonic distortion plus noise at several selected points across the spectrum. It should not exceed 0.02%, when measured at 10 dB above nominal signal level.

d) Turn the audio signal off. With a 600Ω termination on the unbalanced input, the output should read -85 dBu absolute, when passed through a 20 kHz low pass filter.

e) Repeat steps a through d for the right channel.

Block Diagram

POD-5 Parts List

Reference Designator Part Value Manufacturer Manufacturer's Part Number

C1 47/50 Phillips 03590015 C2 47/50 Phillips 03590015 C3 0.1/50 Phillips K104K20X7RFVBWN C4 220/10 ITT 220M10 C5 47/50 Phillips 03590015

C6 47/50 Phillips 03590015 C7 0.1/50 Phillips K104K20X7RFVBWN C8 0.1/50 Phillips K104K20X7RFVBWN C9 220/10 ITT 220M10 C10 through C13 0.1/50 Phillips K104K20X7RFVBWN

C14 0.01 Aselco CQ92-MC-100-103J C15 through C18 47/50 Phillips 03590015 C19 through C21 0.1/50 Phillips K104K20X7RFVBWN C22 through C25 22P Phillips 638-10229 C26 0.1/50 Phillips K104K20X7RFVBWN

C27 47/50 Phillips 03590015 C28 0.1/50 Phillips K104K20X7RFVBWN C29 220/10 ITT 220M10 C30 47/50 Phillips 03590015 C31 47/50 Phillips 03590015

C32 0.1/50 Phillips K104K20X7RFVBWN C33 0.1/50 Phillips K104K20X7RFVBWN C34 220/10 ITT 220M10 C35 through C38 0.1/50 Phillips K104K20X7RFVBWN C39 47/50 Phillips 03590015

C40 47/50 Phillips 03590015 C41 0.1/50 Phillips K104K20X7RFVBWN C42 0.1/50 Phillips K104K20X7RFVBWN C43 through C46 22P Phillips 638-10229 C47 0.01 Aselco CQ92-MC-100-103J

C48 0.1/50 Phillips K104K20X7RFVBWN C49 47/50 Phillips 03590015 C50 through C53 10/25 ITT 10M25 C54 0.1/50 Phillips K104K20X7RFVBWN C55 0.1/50 Phillips K104K20X7RFVBWN

C56 1000/63 Phillips 02118102 C57 1000/63 Phillips 02118102 C58 680/63 Phillips 02118681

D1 through D11 1N4003 Motorola 1N4003 D12 1N4748 National 1N4748 D13 1N4748 National 1N4748 D14 1N4003 Motorola 1N4003 D15 1N4003 Motorola 1N4003

DS1 PWR 'ON' LED Dialight 551-0405

F1 1/4A Secondary Fuse Littelfuse 251.250

J1 and J2 XLR-3F Neutrik J3 through J6 RCA x 4

P1 and P2 XLR-3M Neutrik P3 Power Connector Panduit

R1 100K 1% 1/4W Resistor Phillips MRS25F R2 8K25 1% 1/4W Resistor Phillips MRS25F R3 7K5 1% 1/4W Resistor Phillips MRS25F R4 2K Horizontal Trimpot Piher PT10V-2K R5 100K 5% 1/4W Resistor Phillips CR25 Reference Designator Part Value Manufacturer Manufacturer's Part Number

R6 16K2 1% 1/4W Resistor Phillips MRS25F R7 100K 1% 1/4W Resistor Phillips MRS25F R8 12K 5% 1/4W Resistor Phillips CR25 R9 100K 1% 1/4W Resistor Phillips MRS25F R10 8K25 1% 1/4W Resistor Phillips MRS25F

R11 7K5 1% 1/4W ResistoR Philips MRS25F R12 2K Potentiometer Piher PT10V-2K R13 100K 5% 1/4W Resistor Philips CR25 R14 8K2 5% 1/4W Resistor Philips CR25 R15 6K8 5% 1/4W Resistor Philips CR25

R16 4K3 5% 1/4W Resistor Philips CR25 R17 150K 5% 1/4W Resistor Philips CR25 R18 15K 5% 1/4W Resistor Philips CR25 R19 4K7 5% 1/4W Resistor Philips CR25 R20 4K7 5% 1/4W Res

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