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  1. Damien

    mod an atx supply with the at2005 chip.

    Hey there I'm trying to mod an atx supply with the at2005 chip. I've put a 50k pot between 12v rail and ground with the wiper going to pin 2 (voltage adjust) Problem is that as soon as it hits about 13 volts it shuts down due to I suspect over voltage protection circuitry. Is there a way of...
  2. Damien

    PNP transistor in CLass B push pull amplifier

    Hey guys I'm having a little trouble understanding how the PNP transistor in this circuit conducts half of the audio wave form as I believe that it must source it's current from the NPN transistor & if the PNP is to conduct on the negative half of the wave form (As this is what it's job is) It...
  3. Damien

    2n3055 saturation

    Hi there I am wondering if someone out there knows how much the 2n3055 requires to be fully on (saturated) Having a look at the datasheet is says - Collector−Emitter Saturation Voltage − VCE(sat) = 1.1 Vdc (Max) @ IC = 4 Adc Does this mean that it is saturated at 4a 1v? What if the voltage...
  4. Damien

    Blown 2n3055 transistors

    Hey guys I'm a little stumped as I just put my power supply together which long story short consists of an lm317 driving two 2n3055 pass transistors. These 2n3055's are rated for 15 amps each and they're paralleled so I should theoretically get 30 amp handling capacity. I tested it out last...
  5. Damien

    Electrons

    Hey hey Just doing a little research on electrons to try and understand how a fluorescent light tube works. From what I can fathom, an "ion" is an electrically charged group of atoms that can be either negatively charged or hold a positive charge. A "cation" A.K.A "positive ion" is a...
  6. Damien

    5v linear voltage regulator design problem.

    Hey guys I was wondering if someone has a spare moment if they would would mind sharing their ideas as to why a makeshift 5 volt regulator transistor had a lot of heat being thrown off it with such a small load. Scenario: We're about to head to a camping spot to go camping, and I decide that...
  7. Damien

    Lab power supply from microwave transformer project.

    Hey guys I'm at a standstill with my project. I've been playing around with really basic electronics for years but thought I should take it to the next step, decided to make myself a big battery charger for charging a bank of batteries while we're camping and use our 240v gennie but have it so...
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