![]() ![]() one of the nice things about this transformer is all the shielding - be sure to take advantage of that - I would tie at least A3 and the transformer chassis to the cleaner ground - so the mixer. you should work it so the ground lift works with the reamp circuit as well.Ĥ. I would definitely use the level control for the reamp send to the guitar - it will save you a lot of fiddling - as for the impedance pot - i have made reamp boxes with them and without - it just depends - some pedals don't like being fed from a low source Z - a fuzz face is the perfect example.ģ. You might actually be better served running thru the transformer the other way for the reamp. So first and foremost there is the gain issue - you have a 15:1 pad for the line in which looks like 602Ω (its a bit low for todays standards, but acceptable so long as the source can drive it) - assuming +4dBm in, were at -26dBm after the pad - which would be fine - except you have over 20db of gain thru the transformer - so your running a bit hot - but the bigger issue i believe tho is the source impedance driving the Reamp is really high thru the step up action of the transformer. in general a reamp box is to go from line level (+4dBm) to instrument level (-20dBm) and the impedance pot is there to mimic the high source impedance a guitar might present. Mic Preamp Application Schematics Line Input Application Schematics Line Output Application Schematics General Interface Application Schematics Musical. that said, i understand switching between ground and ground thru the low value cap, but i don't understand the RC network.Ģ. I think what you mean to do is have pin 1 terminated to the shield/chassis ground/power supply ground in one switch position and then lifted above that but the RC network in the other position - as it is in the Jensen drawing. I don't think your ground lift is going to do what you want it to - I think its just a drawing error - but right now, you're not grounding pin 1 of the XLR to the Hi-Z input shield - you are stilting pin 1 above the HiZ shield by 100Ω in parallel with a 2.1uf cap (or maybe that is C2_100nF?). I can't wait to build this thing so I'm really really curious to hear what you will say!ġ. I can't believe I made such a simple thing so complicated, D but there is simply so much I don't know, hence the myriad of questions. ![]() Makes sense? e In the data sheet (attached) it says "Do not pass DC through the windings." Would I pass DC through the windings if I engaged the 48V at the XLR output? If yes - how to block? (caps?) f) Any further, hints, insights, caveats? d) Do I (really) need a pad in the unbalanced part of the schematic? I think basically all guitars have a volume control, so I'd rather turn that down (to not "overdrive" the x-former), instead of engaging a pad at the DI box. XLR input/output is split into TRS input for line level (for reamping) and XLR mic level output (for DI purposes). No Z pot for more simplicity (unless you convince me it is ABSOLUTELY necessary )Ģ. ![]() I know there are some other schematics around, I studied them carefully and tried to understand them. the popular LINE2AMP also shows a resistor in parallel with the transformer. For simplicity's sake I don't want such a potentiometer. Jensen included an impedance matching pot in their design (notes) - see attachment. Is it really necessary? Did I even get the correct values for the H-pad is this a reasonable attenuation factor? b) Doesn't the transformer do all the impedance matching, or do I really need a resistor in parallel with the transformer?ġ. Could you smart people out there be so kind as to have a quick glance at my schematic and tell me if it makes sense to you? Here are my issues: a) I'm not sure about the H-pad, in the ReAmp signal path. basically things are ok but the second transformer Guitar Level to Line Level is not going to work without some active bits for the lefvel change HOWEVER Guitar Level to Mic Level as a standard passive DI box is fine Dave's (NYD) reamp or the Jensen reamp is fine on the way in and any of the usual suspects on the way out use simple guitar patch leads and don't leave the trafos patch when in. JT-MB-D Converts 600 Ohm Unbal.I have a quick request. Two JT-115K-E used in Symmetrical Mic Input Stage JT-115K-E Tube Microphone Preamp Generic Input Stage JT-16-A in Single Stage Mic Preamp with Two DC Servos JT-16-A in Single Stage Low-Noise IC Mic Preamp JT-13K6-C in Simple One IC Stage Mic Preamp Standard Microphone Preamp Input Circuitry Mic Preamp | Line Input | Line output | General Interface | Musical Instrument | Equipment Upgrade | Miscellaneous Mic Preamp Application Schematics App # We thank you for your support and understanding. We ask that you do not distribute these without prior consent from Jensen Transformers Inc. The following schematics are free of charge and available for your sole use by registering as a user. ![]()
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