However it may be useful to have the pad engaged to allow greater level control given the signal level is stepping up. As such, my queries relate to impedance matching and the pad operation.Ĥ) Given the variance with guitar/pedal/amp impedance to begin with, is there any significant issue with using this circuit in reverse as a reamp box since we should be in a (roughly) appropriate range for the output impedance at > 100kΩ?ĥ) Since I'll be varying input level at the desk, I expect the pad will remain disengaged when using the box in reamp 'mode'. Considering this, I don't need the output level pot (as AS092) as I'll be controlling the input level from the desk, and I will omit the impedance pot since this would change the operating point of the voltage divider in the pad. Regarding using this as a reamp box, which I appreciate is not simply the reverse of a DI and there will be tradeoffs taking this approach:įor now I only foresee using this to cancel interference over long runs to amps/getting more appropriate signal levels to use effects pedals as outboard. Anyway, I have a few questions if anyone is able to chime in:ġ) What is the purpose of C1 and C2 on AS066, is this to block unwanted DC components across the input, or something else? Are these strictly necessary?Ģ) On AS007 there is a 6.8kΩ resistor across the input, is this to ensure the transformer always sees an impedance > 6.8kΩ? If so, on AS066, when the pad is not engaged, is there anything lacking with this resistor not being present?ģ) AS006 has an optional AC coupling block - is this worth considering for connecting synths which may exhibit some DC components, or is this over-engineering?
Basing this off the AS066 design, I don't need the -10dB pad or high-cut at the input, so I will omit these going forward. I've looked over the Jensen schematics - 'typical' ( AS007) and 'full-featured' ( AS066) DI boxes, and the reamp box ( AS092) - and have a couple of queries to improve my understanding and inform design considerations.
I see there are a few threads on passive DIs already, but thought it may be helpful to combine my questions in the same place. Hey, this is my first post on the forum - looking for a little guidance with Passive DI / Reamp Box design.
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