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    Transformer coupled transistor amplifier

    Hi, thank you for the reply hero :) I am fine with a simple push pull amplifier, even to slightly more complex stages, e.g. replacing the resistors with current sources etc. I was merely practising the concept of a transformer coupled amplifier. I just wanted to know what flaws my circuit had...
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    Transformer coupled transistor amplifier

    Also, what do think about the zeus amp then? http://www.susan-parker.co.uk/zeus.htm That is a transformer coupled mosfet amp with some quite impressive specification!
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    Transformer coupled transistor amplifier

    I wasnt born! (I'm 17 years old!) I was mainly going on concept for this design. Would NFB really add a significant change in sound quality? I'm using a transformer for the phase splitter now, if I drove that by a transistor, could I add NFB? Cheers :)
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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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    Power Amplifier for Guitar

    Thats good thinking, a chip amp could make this project much easier, lots of little cheapo unbranded guitar amps use chip amps, my marshall 30w bass combo has a TDA2030 chip amp. Audio, wouldn't it be easier for him to understand a simple opamp preamp? I mean a simple TL071 inverting amplifier...
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    Switched capacitor voltage boosters

    The 74C14 is the same as the 40106 isn't it? I'm happy with the voltage it is at (the capacitors I have are only rated to 63v, hence why I only used the 4 stages). Would adding another stage not decrease the current I could supply? I was thinking of using one of these switched capacitor boosters...
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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

    I do know about the power output being about 10x less with the TA2024 than the TDA8920 lol otherwise, I think I would've made a pretty large mistake! I do know that Tripath went bankrupt but I really don
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    Switching power supplies and Earth

    Just to answer incase anybody is looking for the future :) I used two 4.7uF 63v capacitors on each of the positive terminals of the power supply and connected them to the earth terminal on the power supply. The electric shocks have now gone and the noise has been reduced too! Thank you hero :)
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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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    Idiot's guide to transformers ?

    Hi, good luck with getting the transformer working, unfortunately if the outputs are sorted, it might be unfixable :/. If the transformer in itself is quite large, I can imagine the secondary coil is that large for the current capability of the transformer. Hopefully the 'Guy in the shop' will...
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    Idiot's guide to transformers ?

    Have you tested resistance on the coils? Just to ensure that theyre not shorting or anything? If that all checks out, try replacing the rectifier unless the rectifier and transformer is as one package then that may be a small problem. With your other transformer, try reading each winding to get...
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    Can someone help me identify this part?

    I think the output voltage will be dependant on the load. I can imagine the 220k resistor is there for safety reasons. When the night light is unplugged, the resistor will ensure that the 560nF capacitor is safely discharged. I couldn't find anything from a quick search on google but I can...
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    Can someone help me identify this part?

    I think that most resistors (standard ones) are rated to 250v but im not 100% on that. for a cap to be "AC" I suppose it just needs to be unpolarised so really, it can be any capacitor that isnt a polarized electrolytic, e.g. Mylar or Polystyrene etc. To lower the AC voltage, if you put the...
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    High Voltage low amperage

    Possibly a flyback converter? They can usually be output current limited by limiting the current availiable to the transformer. Do you need it to be highly efficient or are you not too fussed?
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    Can someone help me identify this part?

    I'm thinking Polypropelyne capacitor? Normally they are used in that sorta thing and since the PCB has a photodiode on, it may be some light activated night light or such? From what I can see, the capacitor is: Rated voltage 400v Rated capacitance 564k = 560nF or 560000pf (56 with 4 zero's) :)...
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    Class D Bass amplifier

    Agreed 100% :)
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    Eliminating Battery Charger Noise on DIY Stereo

    One good way of possibly doing it is to filter the supply to the amplifier with an LC filter. If you know the frequency of the charger hum, you can base the filter frequency on this but otherwise, find the largest inductor that is ok with your current required for your amplifier and use that...
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