Cisco 9900 Series 50-1000MHz RF Signal Splitter Teardown

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Cable TV Networks This Cisco headend/hub RF combining and splitting networks is used in Hybrid Fiber-Coaxial networks. HFC is a telecommunications industry term for a broadband network that combines optical fiber and coaxial cable. Advanced HFC networks include numerous 2-way interactive services that have changed the requirements for the configuration and flexibility of the systems. […]

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Tesla Coil Show Controller – Analog Audio Interrupter and Test (Part 6 of 8)

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In this video I install and test the analog audio interrupter and gives a walk-through on how I am using it. All schematics for the circuits and PCB layouts are available at the project thread: Project thread: https://highvoltageforum.net/index.php?topic=1417.0 The DRSSTC analog interrupter audio input is quite simple and build up around a single LM339 op-amp.

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Telemechanique Altivar 58, 10kW Motor Drive Teardown

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The ALTIVAR 58 (ATV58) family of adjustable frequency AC drive controllers is used for controlling three-phase asynchronous motors. This controller in from the range of: 1–75 hp (0.75–55 kW) constant torque (100 hp variable torque), 400/460 V, three-phase input. In this teardown, I am giving you an overview of how its built, non-destructively as the

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DIY 30W LED Work Lamp From a Discarded Street Light

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I found a discarded street light head at a scrap yard and wanted to give it a new life instead of being shredded. Re-use, re-purpose or re-invent. Do not just throw out stuff, see if you can use it in another way. The Earth Overshoot Day is something to take seriously. https://www.overshootday.org/ The original lamp

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Tandberg TT1200 DVB MPEG-2 Decoder Teardown

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Teardown of some old and discarded DVB MPEG-2 Decoders that have been used in a large buildings distributed TV network. Despite that units look the same on the outside, they turned out to be very different hardware revisions on the inside. The front of the Tandberg unit only has a display and 4 input keys.

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Tesla Coil Show Controller – Syntherrupter Installation And MIDI Test (Part 5 of 8)

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In this video I mount, update and test the Syntherrupter with its MIDI capabilities and gives a walk-through on how I am using it. Some of the details from the video is written as a part of this post. To read all the parts, read the article about the complete DRSSTC controller project. First I

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Teardown of Servomex CO2 Analyzer 1400 Series

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Old discarded equipment from a agriculture laboratory. Unfortunately damaged from the rough handling. This CO2 analyzer measures the CO2 levels in emissions using the principle of infrared absorption. It is used after a gas preparation system and set-points can be pre-defined and an alarm can be sounded if they are exceeded. A flow-rate alarm is

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Teardown of Kathrein 1800/900 MHz Antenna For Mobile Phone Base Station

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Teardown of a Kathrein Dual Panel 1800/900 MHz used for both GSM (2G) and 3G mobile broadband technologies. It also has options for Remote Electrical Tilt (RET). On the inside we will find phase changers, splitters, combiners and 1800/900 MHz antenna elements. I give a walk-through of the circuit, what the different elements does and

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