kevin gilmore
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this is why i have 4 sets of tires for 2 cars. seriously under 40 degrees F is death for summer only performance tires. besides which the tires will crack and then you have to throw them out.
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koss pro4a ? definitely koss
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and now for something completely different part 3
kevin gilmore replied to kevin gilmore's topic in Do It Yourself
with the sanyo transistors 5v results in about 500ma bias. which was the original design spec for this board. -
and now for something completely different part 3
kevin gilmore replied to kevin gilmore's topic in Do It Yourself
you need to measure the voltage across q36 should be about 5 volts. if not adjust rv2 and if that is not enough change r36 -
and now for something completely different part 3
kevin gilmore replied to kevin gilmore's topic in Do It Yourself
minimum power supplies +/-24 might have to change a couple of resistors in the bias generator for this output transistor. -
and now for something completely different part 3
kevin gilmore replied to kevin gilmore's topic in Do It Yourself
what is the name of the gerber file for the output board -
super thin traces are never a good idea. just ask cavalli.
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yes the distance matters. always put caps as close to the chips as possible. probably need a scope to see whats happening to the power rails. possibly one of the diodes on the input lines is in the wrong direction.
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solder on some .1uf caps on the power supply lines on each chip close to the pins. also no diodes that i see across the relay coils.
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goldenreference low voltage power supply
kevin gilmore replied to kevin gilmore's topic in Do It Yourself
much better. max sensitivity of the qa403. 60 hz and multiples are very hard to remove, moving wires around in the box and things will change. completely inaudible. the synchronous rectifiers may take out even more noise. mumetal shielding around the transformer is also a good idea. glad that more and more people are buying the qa403. higher quality diy coming soon -
goldenreference low voltage power supply
kevin gilmore replied to kevin gilmore's topic in Do It Yourself
might want to try again with a good quality mylar cap say 1uf in series with the power supply outout. you should be able to get better resolution. -
need to see the whole board. definitely missing the power supply caps at the lm339
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Hi Kevin,
Victor here. I have been missing in action for a long time. I hope you are keeping well and thank you for your selfless contribution to us.
I have not completed my megatron amplifier but I intend to do so soon. I notice that my power supply has a +15 and -15v but the megatron only has a +15. Does that mean that I only have to connect the -15 and leave the +15 unconnected? Mine is the earliest megatron boards. -
finally an electrostatic transportable
kevin gilmore replied to kevin gilmore's topic in Do It Yourself
pretty close to production now.
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finally an electrostatic transportable
kevin gilmore replied to kevin gilmore's topic in Do It Yourself
first picture is baseline with 6db antenna 0 to 100mhz 10db/major division 10mhz per horizontal major division top line -30dbm 1 inch from power supply. second picture is with the 600v power supply turned on and into a 1meg ohm load. 3rd picture is hall probe on the input power supply line. so 200khz flyback switching frequency.
