mboxler
Regulars-
Posts
574 -
Joined
-
Last visited
Content Type
Forums
Events
Gallery
Everything posted by mboxler
-
@senzlez2, does the new layout make sense? As @wingletpointed out, the inductor was the biggest problem. The capacitor issue would have just made it sound different. If my alphabet system works, I'll tag the tweeter circuit as I (we) see it should be just to be sure it's okay. We all started out where you are. Don't be discouraged, it's a learning experience. Mike
-
Dean's right. The larger the inductance between the output taps to more the filter behaves like a first order vs a second order. Unfortunately, I can't remember if that test was with a new T2A or the way-out-of-spec one I removed from my Heresy. I'll rerun that voltage test with the Heresy one just to be sure.
-
I agree, but I think there are other issues. Looks like the amplifier is directly connected to the 30uf capacitor. I'll try another approach. Hopefully clearer??? Connect Woofer IN- to Woofer OUT- (new black wire). Connect Woofer IN+ to A (new red wire). Connect B to Woofer OUT +. Connect B to C. Connect C to E. Connect D to GROUND. Connect F to G. Connect H to I. Connect J to GROUND.
-
I'm very sorry. Once I rotated the picture things got clearer. I've drawn how one way to wire the circuit. It follows the schematic in component order, although it could be wired other ways. I'll try to write out what needs to be done. Red is the positive path, Blue is the negative path. The red circles mean no connection. Woofer in + to 1.3mh in. 1.3mh out to Woofer out + AND 30uh in AND 8.2 ohm resistor in. 30uh out to ground. 8.2 ohm resistor out to 75uf in. 75uf out to 3.6mh in. 3.6mh out to ground. Does that look right @winglet? Still on my now cold first cup of coffee. EDIT: I rotated the picture 90 degrees. Left is input right is output.
-
I see problems on the tweeter side. I have a feeling you don't measure an open circuit across the tweeter terminals with no straps? I'll try to draw how it should be. It may take a while. In the mean time, if you read around 4 ohms on the woofer terminals without the straps you should be able to hook your amp to just the woofer terminals and see how that circuit performs.
-
8 ohms is a nominal figure measured with 20 to 20000hz sweeps. Your multimeter is sending and measuring DC, which won't work. That's why you need to measure drivers disconnected from the crossover to measure the DCR of the voice coil. Once you apply AC everything changes. I happen to have a pair of RF-83's. I'll check resistance at the terminals and get back to you. I'd still give it a try now that the resistor can do it's job.
-
Sorry, I meant a wire from the bottom - to the top - with no other added connections. That resistor is already connected to the bottom -. You've shorted out the resistor with that joint. Try desoldering that spot and bend the wire over that "intersection" to see if that fixes the issue. Later I'd clean that up.
-
As already stated, the two biggest differences between the T2A and the others is the inductance and the -3.35db tap. Of the two, I believe the inductance has the biggest effect. Of course, the combination of a "brighter" polypropylene capacitor combined with .35db less attenuation might be noticeable as well. Even though all of the autoformers will result in a 2nd order high pass to the squawker, the inductance between taps 0 - 4 dictates how high in frequency the 12db slope extends. The lower the inductance, the higher in frequency the 12db slope extends. I can't find any published specs on the 3636, but one of them I have measures around 90mh between taps 0 - 5. The published inductance of the T2A is 45.6mh +/- 15%. A T2A I removed from an old Heresy measures 32mh. Since the inductance between taps 0 - 4 forms the second order, the values are... 3636 45mh T2A (spec) 21.2mh T2A from my Heresy 15mh Although my T2A may be an extreme case, you can imagine the difference the shunt inductance would make. Mike
-
Looks to me you are missing a common ground wire on each circuit. I assume the bottom of the picture is input? If you run another black wire from the bottom right screw to the top right inductor (where the other black wire is connected) the woofer circuit should work. Likewise on the tweeter circuit. Unless you connected them underneath the board??? Mike
-
What DC reading did you get? Sounds like you need a larger capacitor.