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The square-wave rise/fall time-switching generates "infinite" number of odd harmonics. Filtering & shielding are needed.
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Yes, I gave you a 'thumbs-up' for that one...which DOES work well IF the PI outputs are nearly balanced so they cancel each other; if not, whatever the difference...Last edited by Old Tele man; 01-01-2020, 07:46 PM.
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Something to consider about the "standby" switching event:
1) Switching B+ (between rectifier & first cap) involves highest voltage...Last edited by Old Tele man; 12-29-2019, 01:26 AM.
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Unfortunately, he does, especially in the green book; for example, on page 66 in Chapter 3: "At full power, the Champ creates about 5W RMS in a 3.2Ω...Last edited by Old Tele man; 12-22-2019, 07:43 PM.
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Richard sent me a copy (green cover) for review...he also sent me a copy of his newest (red cover) book: Fundamentals of Guitar Amplifier System DesignLast edited by Old Tele man; 12-20-2019, 11:12 PM.
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Short answer: probably.
Schematic indicates OT 4-ohm (minimum) load with ONE speaker, which is "switched" to OT 2-ohm when second...
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It's an "open" path when the switch is OPEN and thus no current passes through resistor R27, however, it WILL have a voltage when probed with a...
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Yep, "...non-inductive, "swamping" resistor in parallel with each amp's OTs winding input to switching circuit..."
as I stated...
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Absolutely! "Opening" the OT output while signal is applied is akin to "automotive breaker points 'opening' on older ignition systems,"...Last edited by Old Tele man; 10-07-2019, 05:46 PM.
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Adding a C to an existing R will create an RC-filter, you wanting to roll-off / reshape the bandwidth or something?
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Excerpted from F. E. Terman[2]
“1. To the extent that mu (µ) is constant and that Eq. (6-10) is true, the plate resistance (rp) depends on the...Last edited by Old Tele man; 08-02-2019, 07:38 PM.
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A single, SERIES resistor voltage "drop" is solely dependent upon the output/load current passing through it; more current yields more "drop"...Last edited by Old Tele man; 07-24-2019, 09:25 PM.
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The REASON for eqaul-sized "balancing resistors" is to "EQUALLY" divide the voltage across the two caps at FULL/peak voltage and NOT during...
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Actually, you are correct -- I mis-typed -- the Vg "value" should be 35Vg, derived from one-half of Vgg; ie: Vg = (70Vpp/2). Hopefully, I haven't...Last edited by Old Tele man; 06-24-2019, 05:43 PM.
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0.637 is AVG of fullwave rectified signal.
Because both ELECTRONICS engineers and ELECTRICAL engineers use the same physics principles and terminologies,...Last edited by Old Tele man; 06-23-2019, 04:52 PM.
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Regarding amplifiers, I repeat "...there is NO such thing as RMS power...it's AVERAGE power."
The Root-Mean-Square (RMS) mathematics...Last edited by Old Tele man; 06-23-2019, 04:24 PM.
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That value is directly quoted from the GE/RCA 6L6GC datasheets...worked great from them back in the hey-day of vacuum tubes.
For example:...Last edited by Old Tele man; 06-20-2019, 11:12 PM.
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Your assertion *IS* valid when Vg(rms) exactly equals Vg(bias.dc), which rarely happens; typically Vgg/2 is "less than" Vg(dc) by a couple volts,...Last edited by Old Tele man; 06-20-2019, 11:37 PM.
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...and he (me) also later explains that the DC bias voltage is assumed to equal the AC(rms) driving signal for estimating Po from the schematic values of...Last edited by Old Tele man; 06-20-2019, 11:24 PM.
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