An amplifier for Arduino
This circuit can be used as an amplifier to switch on and off a DC motor and to regulate its spinning speed with a PWM source generator.[more]
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Arduino projects
This circuit can be used as an amplifier to switch on and off a DC motor and to regulate its spinning speed with a PWM source generator.[more]
Bi-Directional 2.4 GHz One Watt Amplifier With Receive Pre-Amp
This will show you how to add a bi-directional, 2.4 GHz amplifier to your Proxim Symphony for under $100. Bi-directional means you can mount the amplifier at the antenna to help overcome any cable loss, and the amplifier will automatically switch between receive and transmit modes. The cost is reduced by using readily available materials and components. Also, instead of a complicated RF sensing transmit/receive switch, a logic level indication of transmit is sent to the amplifier through a length of low cost coaxial cable.[more]
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RF projects
Experimental KW Switching Power Supply
Ralph W5JGV writes:This is an ongoing narrative of my attempt to construct a high-power switching power supply to replace the failed power supply in my Heath Warrior amplifier. Since I use the amplifier for experimental (non-Ham) work, it sometimes has to operate at full CW power for several hours at a time. The original plate transformer is unsuitable for that task, so I am attempting to build a really heavy-duty supply to replace the original power supply.My design concept started when I inherited a large quantity of well-built Dell computer power supplies. They were rated for 230 watts, and some testing showed that the switching transformers in the supplies could easily handle 250 watts. Hmm… If there was just a way that I could make these things put out HV instead of +5 Volts, I’d be all set. Well, to work! [more]
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How to | Power controller
LM3886 Power Amp with DIY Chassis
This is a simple chassis using just 4 aluminum panels and 2 heatsinks. Designed around dimensions to tightly pack in a LM3886 chip amp kit.The top and bottom panels sit in ridges cut into the heatsinks with a table saw, and then the front and back panels just bolt into the end fins. Rear panel fixings are held with M3 nut and bolts, and panels that join to the heatsinks are held by M4 bolts tapped directly into the heatsinks so no additional brackets are required. Heatsinks are 75 x 160 x 50mm with a 10mm thick base.[more]
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Amplifier projects | DIY projects
