Lot of three (3) API 2520 all discreet operational amplifier packages. These were found among a lot of parts acquired from a deceased technician. UNTESTED AND AS IS. ALL THREE ARE UNUSED SHOWNING NO SIGNS OF EVER BEING SOLDERED OR USED.

Key Digital’s 4K AV over IP system may be scaled to fit any installation need. Add an Encoder per video source or Decoder per video display and use a verified network switch as the central point of this HDMI AV routing and distribution system. The Key Digital 4K AV over IP system is completely integrated, with Encoder and Decoder product options including video wall, control, audio pre-amp, app-ready user interface capabilities, and more.FEATURESAV Over IP: Utilizes a managed gigabit network switch to enable HDMI video distribution, matrix switching, and signal extensionVideo Wall Processing: Encoder + Decoder systems create video walls with up to 16x16, 256 total maximum displaysControl: 3 multi-function ports may be used as Compass Control® Pro master controller, by IP control systems via KeyCode open API, or as a third-party control interfaceKey Digital® App Ready: Network scan & detect populates pre-built GUI including optional image preview, finger drag video wall management, source and display control of popular devices via IRKDMS Pro Ready: PC software for unit & system setup and control UI with clean End-User mode option including optional image preview, mouse-drag video wall management, source and display control of popular devices via IR and PJ LinkHDMI Pass-through: Tx unit HDMI Pass-through to connect local monitor, HDMI Audio systemsAudio De-Embedding: Audio from the HDMI input is de-embedded through Analog phoenix terminal to enable external audio connectivity with audio systems and amplifiersAudio Pre-Amp: Volume, muting, 3-band EQ, and lip-sync delay controllable on audio de-embed portUSB 2.0: Routing follows AV source / display selection with maximum of 4 USB keyboard or mouse devices simultaneously routed to a single host computer / encoder. 1.5Mbps maximum bandwidth. Webcams not supported. For non-keyboard & mouse device inquires, please contact Technical Support before purchase4K/Ultra HD Resolution: Support for 4096x2160 or 3840x2160 24/25/30Hz at 4:4:4/8 Bit (10.2Gbps max bandwidth)4K Down-scale: Incoming 4K resolution can be down-converted to 1080p or 720p at each decoder, enabling monitors to display content at optimal resolution at all timesSignal Extension: Up to 330 ft. / 100 m @ 4K 24/25/30(4:4:4) into network switch or or point-to-pointPower over Ethernet: Does not require power supply when integrated with compatible PoE network switchRedundant Power Connection: Added reliability for non-PoE integrationHDCP 2.2: Compliancy up to HDCP 2.2 and backward compliantData Stream Bandwidth: ? 850Mbps at 4K, ? 250Mbps at 1080K, ? 125Mbps at 720p / 1080iLatency: <40ms at 4K. Less at lower resolutionInstallation: Use KD-SMS16 to cleanly install up to twelve ENC/DEC units in rackRS-232/TCP-IP Control Mode: Provides control of unit as well as connectivity statusSurround Audio: Support for Dolby® TrueHD, Dolby® Digital Plus, Dolby Atmos®, and DTS-HD Master Audio™Control System Support: Controllable by all IR, RS-232 & TCP/IP supported control systems via open APIADDITIONAL FEATURESHDMI® and HDCP Licensing: Fully licensed and compatible with HDCP 2.2 and HDMI latest technology such as 4K/UHD 4:4:4EDID Control: Internal library features 15 default EDID configurations and native EDID data from Output/Display devices connected to DecoderHot Plug Detection Control: Enables integrator to choose if active signal voltage is forced to connected input devicesFull Buffer System™: Manages TMDS re-clocking / signal re-generation, HDCP authentication with source & display, EDID Control handshake, and Hot Plug controlHDR (High Dynamic Range): HDR is achieved with AppleTV source at 4K/30 [4:2:2] 12bit deep color, enabling more life-like images through a greater range of luminance levelsIR Sensor: Sensor powering via +5V IR In port collects line-of-sight IR from remote(s) without external IR connecting blockUp/Down IR: Two channels of IR enable control to/from devices connected to Encoder and Decoder unitsRS-232: Bi-Directional control to/from Encoder and Decoder unit on Phoenix connectorSPECIFICATIONSTechnical:Inputs: 1 TCP/IPOutputs: 1 HDMI, 3 Multifunction Control (IR, Bi-Directional RS-232, Trigger), 1 TCP/IP, 2 USB-ADDC Signal (Data): 5 Volts p-p (TTL)HDMI Video/Audio Signal: Input Video Signal: 1.2 Volts p-pHDMI Connector: Type A, 19 Pin FemaleAudio Connector: Balance/Unbalanced 6-Pin Phoenix, 3.5mm StereoRJ45 Connector: Shielded TCP/IP 1G/100 BaseT, PoEControl Connectors: 3-Pin PhoenixGeneral:Regulation: CE, RoHS, WEEEEnclosure: Black MetalPower Supply: 12V/1A, 20W, desktop typeProduct Dimensions: 6.25” x 1.1” x 3.1”Packaging Dimensions: 9.8” x 4.5” x 3.35”Product Weight: 0.9 lbShipping Weight: 1.5 lbBTU: 30.7 per hourOperating Temperature: 150°F (65.5°C)Surface Temperature: 104°F (40°C) at 77°F (room temperature)ACCESSORIESPower Supply (Sold Separately): 12V/1A, 20W, desktop type, model KD-PS20W12VCUSB Data Cable 6ft, A to Micro (qty 1)3-pin phoenix terminal (qty 3)IR Sensor with stripped wire. Red = +5V Sensor power, Black = Ground, White = IR Signal (qty 1)IR Emitter with stripped wire. Stripe = IR Signal, Solid = Ground. Model KDIRE3501F1 (qty 1)L-Bracket Mount (qty 2)Screws for L-Bracket (qty 4)Operation User Manual (qty 1)

Key Digital’s 4K AV over IP system may be scaled to fit any installation need. Add an Encoder per video source or Decoder per video display and use a verified network switch as the central point of this HDMI AV routing and distribution system. The Key Digital 4K AV over IP system is completely integrated, with Encoder and Decoder product options including video wall, control, audio pre-amp, app-ready user interface capabilities, and more.FEATURESAV Over IP: Utilizes a managed gigabit network switch to enable HDMI video distribution, matrix switching, and signal extensionVideo Wall Processing: Encoder + Decoder systems create video walls with up to 16x16, 256 total maximum displaysControl: 3 multi-function ports may be used as Compass Control® Pro master controller, by IP control systems via KeyCode open API, or as a third-party control interfaceKey Digital® App Ready: Network scan & detect populates pre-built GUI including optional image preview, finger drag video wall management, source and display control of popular devices via IRKDMS Pro Ready: PC software for unit & system setup and control UI with clean End-User mode option including optional image preview, mouse-drag video wall management, source and display control of popular devices via IR and PJ LinkHDMI Pass-through: Tx unit HDMI Pass-through to connect local monitor, HDMI Audio systemsAudio De-Embedding: Audio from the HDMI input is de-embedded through Analog phoenix terminal to enable external audio connectivity with audio systems and amplifiersAudio Pre-Amp: Volume, muting, 3-band EQ, and lip-sync delay controllable on audio de-embed portUSB 2.0: Routing follows AV source / display selection with maximum of 4 USB keyboard or mouse devices simultaneously routed to a single host computer / encoder. 1.5Mbps maximum bandwidth. Webcams not supported. For non-keyboard & mouse device inquires, please contact Technical Support before purchase4K/Ultra HD Resolution: Support for 4096x2160 or 3840x2160 24/25/30Hz at 4:4:4/8 Bit (10.2Gbps max bandwidth)4K Down-scale: Incoming 4K resolution can be down-converted to 1080p or 720p at each decoder, enabling monitors to display content at optimal resolution at all timesSignal Extension: Up to 330 ft. / 100 m @ 4K 24/25/30(4:4:4) into network switch or or point-to-pointPower over Ethernet: Does not require power supply when integrated with compatible PoE network switchRedundant Power Connection: Added reliability for non-PoE integrationHDCP 2.2: Compliancy up to HDCP 2.2 and backward compliantData Stream Bandwidth: ? 850Mbps at 4K, ? 250Mbps at 1080K, ? 125Mbps at 720p / 1080iLatency: <40ms at 4K. Less at lower resolutionInstallation: Use KD-SMS16 to cleanly install up to twelve ENC/DEC units in rackRS-232/TCP-IP Control Mode: Provides control of unit as well as connectivity statusSurround Audio: Support for Dolby® TrueHD, Dolby® Digital Plus, Dolby Atmos®, and DTS-HD Master Audio™Control System Support: Controllable by all IR, RS-232 & TCP/IP supported control systems via open APIADDITIONAL FEATURESHDMI® and HDCP Licensing: Fully licensed and compatible with HDCP 2.2 and HDMI latest technology such as 4K/UHD 4:4:4EDID Control: Internal library features 15 default EDID configurations and native EDID data from Output/Display devices connected to DecoderHot Plug Detection Control: Enables integrator to choose if active signal voltage is forced to connected input devicesFull Buffer System™: Manages TMDS re-clocking / signal re-generation, HDCP authentication with source & display, EDID Control handshake, and Hot Plug controlHDR (High Dynamic Range): HDR is achieved with AppleTV source at 4K/30 [4:2:2] 12bit deep color, enabling more life-like images through a greater range of luminance levelsIR Sensor: Sensor powering via +5V IR In port collects line-of-sight IR from remote(s) without external IR connecting blockUp/Down IR: Two channels of IR enable control to/from devices connected to Encoder and Decoder unitsRS-232: Bi-Directional control to/from Encoder and Decoder unit on Phoenix connectorSPECIFICATIONSTechnical:Inputs: 1 TCP/IPOutputs: 1 HDMI, 3 Multifunction Control (IR, Bi-Directional RS-232, Trigger), 1 TCP/IP, 2 USB-ADDC Signal (Data): 5 Volts p-p (TTL)HDMI Video/Audio Signal: Input Video Signal: 1.2 Volts p-pHDMI Connector: Type A, 19 Pin FemaleAudio Connector: Balance/Unbalanced 6-Pin Phoenix, 3.5mm StereoRJ45 Connector: Shielded TCP/IP 1G/100 BaseT, PoEControl Connectors: 3-Pin PhoenixGeneral:Regulation: CE, RoHS, WEEEEnclosure: Black MetalPower Supply: 12V/1A, 20W, desktop typeProduct Dimensions: 6.25” x 1.1” x 3.1”Packaging Dimensions: 9.8” x 4.5” x 3.35”Product Weight: 0.9 lbShipping Weight: 1.5 lbBTU: 30.7 per hourOperating Temperature: 150°F (65.5°C)Surface Temperature: 104°F (40°C) at 77°F (room temperature)ACCESSORIESPower Supply (Sold Separately): 12V/1A, 20W, desktop type, model KD-PS20W12VCUSB Data Cable 6ft, A to Micro (qty 1)3-pin phoenix terminal (qty 3)IR Sensor with stripped wire. Red = +5V Sensor power, Black = Ground, White = IR Signal (qty 1)IR Emitter with stripped wire. Stripe = IR Signal, Solid = Ground. Model KDIRE3501F1 (qty 1)L-Bracket Mount (qty 2)Screws for L-Bracket (qty 4)Operation User Manual (qty 1)