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Review: Fusion 600 Marine A/V Series
03 September 2010
Boaties like to have access to radio, music and on larger vessels, video. Whether they are cranking the music up on the long run to fish the continental shelf, relaxing at anchor or keeping track of weather reports, they want performance and state-of-the-art gear.
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Electrolytic Capacitor Reformer & Tester
25 August 2010
Got a bunch of old electrolytic capacitors you'd like to use . . . but don't know if they are any good? Or do you need to re-form the electrolytics in an old valve amplifier or vintage radio set? This Electrolytic Capacitor Reformer and Tester will do the job for you, at any of 11 different standard voltages from 10V to 630V.
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Review: Hameg HMF2550Arbitrary Function Generator
19 August 2010
This signal generator can deliver a 14-bit arbitrary waveform at 250
megasamples per second, a sine or square wave up to 50MHz or a triangle wave up to 10MHz. It can modulate the amplitude, frequency or phase by another generated or external waveform. It also does Pulse Width Modulation (PWM), Frequency Shift Keying (FSK) and more.
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Build A Large Ultrasonic Cleaner
17 August 2010
Most readers would know that you can obtain small ultrasonic cleaners for jewellery and similar small items. So why not a much larger version? It would be great for cleaning automotive and other mechanical parts, fabrics which cannot be machine washed, ornate bric-a-brac and a host of other hard-to-clean items.
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Remote-Controlled Digital Up/Down Timer
15 August 2010
This remote-controlled digital timer has a bright 20mm-high 7-segment red LED display & can count up or down from one second to 100 hours in 1-second steps. Its timing period can either be set and controlled using the remote control or it can be automatically controlled via external trigger/reset inputs. An internal relay and buzzer activate when the unit times out.
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Quad HiFi Gear: How It Stacks Up 30 Years On
13 August 2010
Thirty years ago, any hifi enthusiast worthy of the name would have hocked his soul for a Quad hifi system with electrostatic loudspeakers. But how does the Quad gear of that era stack up against modern hifi gear?
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Solar Power When The Sun Doesn't Shine
11 August 2010
It is often said that solar power plants can't 'do baseload' - that they only provide power when the sun shines. Not so: Richard Keech and Matthew Wright* explain how solar thermal plants work and how the Spanish now get solar power around the clock using advances in thermal storage.
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High-Power Reversible DC Motor Speed Controller
07 August 2010
Here's a 12-32V 30A speed controller that's easy to build. It's available in two versions reversible and non-reversible and features soft start, relay switching of motor direction and PWM speed control.
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Circuit Notebook
05 August 2010
Interesting circuit ideas which we have checked but not built and tested. Contributions from
readers are welcome and will be paid for at standard rates.
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