kevin gilmore
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Everything posted by kevin gilmore
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sure as long as you don't mind the gain, or have a knob elsewhere (or a dac with a volume control etc)
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for the input switch you want to ground the - input for SE inputs don't need a switch on the output because you can do balanced and unbalanced at the same time
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all transformer leads need to be twisted and soldered. and then cranked down good
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- Circlotron
- High Voltage
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you need to lower the value of the resistor in series with the offset pot.
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kimchi ---yum my local Korean grocery store has like 7 different kinds some in buckets equivalent to a gallon or more. But I would rather have the steak
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all the equi=tech are torroids torroids will have less magnetic flux leakage, but will have a turn on thump probably easier to find the EI versions surplus on ebay for far less than you can have one made for.
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10 to 15 ma for the driver board, and 25ma for the output board. But i have tested to 50ma and the heatsinks definitely get toasty that way. No difference in sound after about 25ma
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the rest of the power in the circlotron is pure AC for the filaments, so not much of a turn on whoosh either
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the way the board is layed out currently its really input -> attenuator -> ubal/bal -> diamond buffer because there is only one set of servo's and the attenuator is best at something like 10K
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unbalanced to unbalanced, gain of 1 unbalanced to balanced, gain of 2 etc you can adjust the gain by changing the 1300 ohm resistors, or the emitter resistors up to 10x is possible with no increase in distortion these days, I don't think there is any reason to add much gain
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GRLV split and combined, and any other boards Group Buy
kevin gilmore replied to sbelyo's topic in Do It Yourself
remember that there is both a dynamic and electrostatic current feedback amp. using the bh power supply on the dynamic amp is going to result in much magic smoke. -
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stax mafia circuit boards see updated links on page 5
kevin gilmore replied to kevin gilmore's topic in Do It Yourself
final dns change monday morning machine will end up on 165.124.198.148 and dns will change a few hours after that 2/1/17 edit, final networking address, should stay this way till i retire -
highest hfe, make sure to match hfe and vbe
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GRLV split and combined, and any other boards Group Buy
kevin gilmore replied to sbelyo's topic in Do It Yourself
i have not touched that one in a while. don't see any reason to, i like it the way it is -
transistors are 2sc3324 and 2sa1312
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GRLV split and combined, and any other boards Group Buy
kevin gilmore replied to sbelyo's topic in Do It Yourself
posted final smt version of the ubal to bal board. the smt boards should be cheap because they are tiny, ubal board is 2.42 x 2.12 and the diamond buffer is 1.46 x .8 I would like 4 of the ubal boards, and 8 of the diamond buffer boards please -
that was not a buffer. that was a 60 watt + power amp done with semisouth as output devices.. It was pretty nice for a small chip amp.
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probably close to final 2.45 x 2.17 inch
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lm49830 is a chip amp do you mean opa1632 and its clones, all of which require huge amounts of feedback and have all sorts of common mode dc issues
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diamond buffers will stand vertical on that board. there are thru hole versions of both pieces already
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moar better 2.65 x 2.27 inch
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some people are going to have trouble assembling this, same size for comparison see updated picture below
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correct
