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    Class D audio amplifiers!

    Thanks for the reply :), do you know of ways I could make it more efficient? If I swapped to a TS555 and upped the frequency, could this help? Please help on how I can make it more efficient :D
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    Class D audio amplifiers!

    Hey guys, i've been reading up on Class D amplifiers and how 555 timers can be used for Pulse width modulation. I decided to see how hard it would be to make a simple class d amplifier using a 555 timer. I've included a schematic of my circuit I have designed. Oh yeh, one mistake I did make in...
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    Portable Stereo Project: Amp Woes

    I made a simple amplifier with the TDA2030 in a tech lesson at school, after looking around at what parts my school had, I found an old unsoldered TDA 2030, after soldering some solid core wires onto it, I made a 5W or so audio amplifier out of it, I know this is probably not the way to do it...
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    ELECTRONIC FAUCET

    Do you mean the circuit you used to get from them old 30 in 1 electronic kits? It was a simple audio oscillator with an LFO to sound like a drip from a tap.
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    1.5v to 5v

    Wow! 4 Hours! that would be brilliant, I only expected 2! So as Hero said, how about: Joule Thief bootstrapping a 555 Timer, acting as a PWM oscillator at a given frequency, with a switching output? That circuit would be ok right because I know the joule thief can supply atleast 20mA (to...
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    1.5v to 5v

    Hi there hero! thank you very much for your help and reply. If you re-read my spec, it was 0.2A our, not 1A at 5V. I just wondered if the input current could be kept below 1A because thats the maximum current supplyable by a D cell alkaline battery! Now, I definately do like the switching...
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    1.5v to 5v

    Since the 4047 is in the 4000 series, I assume it doesn't work down to 1.5v? I thought their voltage range was just 3v-15v? Also, I thought that with boost converters, if the duty cycle is higher than 50%, the efficiency can be increased by matching the duty cycle to the frequency and inductor's...
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    1.5v to 5v

    Howdy guys, hope you all had a good Christmas and new year, I haven't been here in ages! Right, i've come across the question of... can somebody help me in designing a circuit that can complete my specification: DISCREET! No maxim or national semiconductor IC's please. 1.5v to 5v, no more than...
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    Single PCB Production

    Hey guys, Does anybody know any websites that can create PCB's cheaply? I use PCB wizard to create my PCB's and i only want to make the odd PCB but most sites I have looked at cost LOADS just for the one PCB! Any help is appreciated, Thanks.
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