Relay supply looks odd. Why are you using stacked caps? I assume this is low voltage.
Also you should probably use much higher value caps...
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I would never make a design that is dependent on which connection is Line and which is Neutral. You simply can’t rely on this being correctly wired in whatever...
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You can simply google ”RC filter calculator” and you’ll find something like this:
http://www.learningaboutelectronics....ticles/Low-pas...
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You only listed voltages. The critical spec is how much current each winding can produce.
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There are several commercial options available. Another is the Radial Tonebone: https://www.radialeng.com/product/headbone-vt
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The simple answer:
With the switch open, R27 is effectively out of the circuit and the resistance between the upper and lower part will be...
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If you use safety resistors, both types are OK.
Make sure to have the safety resistor on the switchbox though, not just amps. Sooner or later...
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Correct, the safety resistor goes between the tip and ground of the speaker jack.
If you have multiple parallell jacks then one resistor is...
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The safety resistor idea comes from Kevin O’Connor’s books. He wrote somewhere that he had never seen an amp damaged by a mismatched load (wrong speaker impedance),...
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The main thing to be careful about when switching speakers is to avoid intermittent load, which can cause voltage spikes and destroy the output transformer....
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All this because of Fender’s epic design fail - using a linear taper master volume pot...
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Badly designed fx loops is probably the main reason they are sometimes frowned upon. Most common design flaw is putting the loop after the master volume....
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Going back to the fx loop discussion, I think delay is the most obvious example. It is almost impossible to get a subtle delay effect if you run it before...
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I like to put a safety resistor of 200 to 1k directly across the OT secondary wires. That way, I’m safe in case if failures or intermittent connections for...
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It sounds like you’re describing the topology of a Dumble Overdrive Special. I would start from there and experiment. If you want to add a Dumble-style overdrive...
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To me, having the master volume before the loop is a really bad idea, as the loop level will depend on how loud you set the amp. Play at low volume and the...
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Cool to have a separate phase inverter for each channel, but I don't understand why? The differences between the two PIs is minimal and it would have been...
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