LE15-Thumper
05-04-2005, 05:03 PM
I used a perf board with pretty good results. I am waiting for the 200k pots to come in to finish it. I tacked a couple of test pots in try it out and it worked perfect ! I used some Wima's and some 1% resistors. Digi-key had all the odd values in stock. I put the TL084 in a socket for ease of replacement.
Instead of running two output jacks I ran one with a Phase toggle switch. I didn't go to the trouble to complete the pre-outs as this application doesn't require it. It's not as pretty as a PCB design but I am fighting the clock on this project. I found the center of boost to be at 26hz. I am not sure if this is true to orig spec, but both my Sine generator and Sencore scope told me the same frequency. The variable crossover pot worked as expected. You have to wire this dual pot with the two resistive elements tied together at the "TOP" of their wipe to get clockwise-freq increase taper effect. I used 3 pin 7815 / 7915 regulators instead of zeners. The PS board is in the lid. The case is an old Blonder Tongue Mast Amplifier that I gutted. Worked pretty good.
Any other questions/ critiques are welcome.
Instead of running two output jacks I ran one with a Phase toggle switch. I didn't go to the trouble to complete the pre-outs as this application doesn't require it. It's not as pretty as a PCB design but I am fighting the clock on this project. I found the center of boost to be at 26hz. I am not sure if this is true to orig spec, but both my Sine generator and Sencore scope told me the same frequency. The variable crossover pot worked as expected. You have to wire this dual pot with the two resistive elements tied together at the "TOP" of their wipe to get clockwise-freq increase taper effect. I used 3 pin 7815 / 7915 regulators instead of zeners. The PS board is in the lid. The case is an old Blonder Tongue Mast Amplifier that I gutted. Worked pretty good.
Any other questions/ critiques are welcome.