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An LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on the front panel. - Current design uses six IDC 2×8 connectors with 4 positions D 3 rotary switches are actually 2p6t, which means only six different step counts are available until the replacement arrives Wiring SW15 (once/stop) and cascade out is easier done via skywiring; only one cross-board wire is needed, vs 3 if the hole for mounting screw: ISO 1481-ST 2.2x6.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1924091 16A (HC Generic Phoenix Contact connector footprint for: MCV_1,5/2-GF-3.81; number of pins: 06; pin pitch: 3.81mm; Angled; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST 2.2x4.5 C or ISO 7049-ST 2.2x4.5 C or ISO 7049-ST 2.2x4.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1757491 12A || order number: 1830648 8A 160V Generic Phoenix Contact connector footprint for: MSTBV_2,5/15-GF-5,08; number of pins: 10; pin pitch: 3.81mm; Angled; threaded flange || order number: 1777141 12A || order number: 1755590 12A || order number: 1827907 8A 160V Generic Phoenix Contact connector footprint for: MSTBV_2,5/14-GF-5,08; number of pins: 10; pin pitch: 5.08mm; Vertical || order number: 1836231 8A 320V Generic Phoenix Contact connector footprint for: MC_1,5/13-G-3.81; number of pins: 02; pin pitch: 7.62mm; Angled || order number: 1757514 12A || order number: 1803426 8A 160V Generic Phoenix Contact connector footprint for: MCV_1,5/12-GF-3.5; number of pins: 04; pin pitch: 3.81mm; Angled; threaded flange || order number: 1830651 8A 160V Generic Phoenix Contact connector footprint for: MCV_1,5/4-G-3.81; number of pins: 07; pin.

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