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    Transformer coupled transistor amplifier

    Hey guys, long time since i've last been here! I've recently designed myself a low wattage transformer coupled transistor amplifier out of parts i've got. I've built it on a breadboard using literally just parts that I could find and at low voltage levels, its quite pleasing to my ear! has a...
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    Depletion mosfet

    Hey guys, Im currently researching into depletion mosfets I was wondering if anyone can tell me where I can get some high(er) power mosfets from, im currently using DN2540's I got off ebay. I have spice'd an amplifier (about 9w), it is only a simple one with no NFB and runs off 60v. I will...
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    Switched capacitor voltage boosters

    Hey guys, i've recently designed myself a simple switched capacitor voltage booster, just using the simple 4069 inverter chip. I was wondering though, can you give me any simple information on increasing the efficiency of my switched capacitor booster? I will include a schematic of what mine...
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    TA2024 Amplifier

    Hi, i was so happy with my Class D amplifier (tda8920) that I thought I would try class D of another brand, so I went ahead and bought a TA2024, Only
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    Switching power supplies and Earth

    Hey guys, I have recently realised... Since the power supply for my bass amplifier is essentially just a single 48v power supply, I seem to get electric shocks when I touch the rear of my amplifier! (The case is "grounded" and metal). So what I was wondering, can I connect the metal case to...
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    Class D Bass amplifier

    Hey guys! I recently finished my first larger project (in a long time!) As Hero will probably remember, I was considering building a Class D Bass amplifier! Well I have done so and completed it now. Spec: 240v Input, Dual laptop supply-age! 170w Output (Theoretical) +/- 24v PSU Based around...
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    Class D amplifier (different kind :)

    Hey guys, Class D amplifiers but a different form this kind, this question is more on OpAmps: Right... I'm looking for an quad opamp that will best suit my job: 2 Opamps being used within a triangle wave generator operating at ~140Khz 1 Opamp as an inverting amplifier to amplify the incoming...
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    Help with creating a power supply

    Hey guys, im wanting to create a Bass amplifier head and for the amplifier section, I want to use the Philips TDA8920BTH, it can provide quite a high amount of power at 0.5% distortion in BTL mode. What I was wondering though was how do I create a mammoth PSU for this amplifier? I would have...
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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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    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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