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Uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on https://www.analog.com/media/en/technical-documentation/data-sheets/8063fa.pdf Altera BGA-36 V36 VBGA BGA-48 - pitch 0.8 mm Highspeed card edge connector for 1.6mm PCB's with 20 contacts (polarized Highspeed card edge card connector socket for 1.57mm PCBs, vertical (source: https://suddendocs.samtec.com/prints/hsec8-1xxx-xx-xx-dv-x-xx-footprint.pdf 0.8 mm BGA-64, 10x10 raster, 4.201x4.663mm package, pitch 0.4mm; see section 7.6 of http://www.st.com/resource/en/datasheet/stm32l072kz.pdf WLCSP-49, 7x7 raster, 3.89x3.74mm package, pitch 0.4mm; see section 7.1.1 of http://www.st.com/resource/en/datasheet/stm32f401ce.pdf WLCSP-49, 7x7 raster, 3x3mm package, pitch 0.4mm; see section 7.2 of http://www.st.com/resource/en/datasheet/stm32f207vg.pdf WLCSP-66, 8x9 raster, 3.767x4.229mm package, pitch 0.65mm WLP-4, 2x2 raster, 0.73x0.73mm package, pitch 0.8mm; http://ww1.microchip.com/downloads/en/PackagingSpec/00000049BQ.pdf#p495 TFBGA-216, 15x15 raster, 13x13mm package, pitch 0.4mm; see section 7.5 of http://www.st.com/resource/en/datasheet/stm32l476me.pdf WLCSP-81, 9x9 raster, 3.693x3.815mm package, pitch 0.4mm; see section 7.4 of http://www.st.com/resource/en/datasheet/stm32l052t8.pdf WLCSP-36, 6x6 raster, 2.61x2.88mm package, pitch 0.4mm; http://ww1.microchip.com/downloads/en/devicedoc/atmel-8235-8-bit-avr-microcontroller-attiny20_datasheet.pdf#page=208 WLCSP-16, 1.409x1.409mm, 16 Ball, 4x4 Layout, 0.5mm Pitch, DSC0010J, WSON, http://www.ti.com/lit/ds/symlink/tps61201.pdf Plastic Small Outline Narrow Body Body [QSOP] (http://www.allegromicro.com/~/media/Files/Datasheets/ACS726-Datasheet.ashx?la=en Allegro Microsystems SIP-4, 1.27mm Pitch (https://www.diodes.com/assets/Package-Files/SIP-3-Bulk-Pack.pdf Diodes SIP-3 Ammo Pack, 2.65mm Pitch (https://www.diodes.com/assets/Package-Files/SIP-3-Ammo-Pack.pdf Diodes SIP-3 Ammo Pack Miniature Wired Open-Loop Current Sensor LEM CKSR 6/15/25/50/75-NP Current Transducer, https://www.lem.com/sites/default/files/products_datasheets/cksr_75-np.pdf LEM HO 40/60/120/150-NP Current Transducer (https://www.lem.com/sites/default/files/products_datasheets/ho-np-0000_series.pdf LEM HO 8/15/25-NSM Current Transducer (https://www.lem.com/sites/default/files/products_datasheets/la_25-p.pdf LEM current transducer (https://www.lem.com/sites/default/files/products_datasheets/hx%203_50-p_sp2_e%20v07.pdf LEM HX06-P hall effect current transducer (https://www.lem.com/sites/default/files/products_datasheets/hx%205_15-np_e%20v10.pdf LEM HX10-P-SP2 hall effect current transducer (https://www.lem.com/sites/default/files/products_datasheets/hx%205_15-np_e%20v10.pdf LEM HX15-P-SP2 hall effect current transducer (https://www.lem.com/sites/default/files/products_datasheets/hx%203_50-p_sp2_e%20v07.pdf LEM HX50-P-SP2 hall effect current transducer (https://www.lem.com/sites/default/files/products_datasheets/hx%203_50-p_sp2_e%20v07.pdf LEM Current Transducer (https://www.lem.com/sites/default/files/products_datasheets/ho-np_0100__1100_series.pdf LEM HTFS x00-P current transducer (https://www.lem.com/sites/default/files/products_datasheets/hx%203_50-p_sp2_e%20v07.pdf LEM Current Transducer (https://www.lem.com/sites/default/files/products_datasheets/ho-np_0100__1100_series.pdf LEM HTFS x00-P current transducer LEM_LTSR-NP 5V supply voltage series https://www.lem.com/sites/default/files/products_datasheets/ltsr_6-np.pdf DFN, 4 Pin.

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