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The "Lovely Cube" Headphone Amp (Lehmann Black Cube Linear Clone)
I guess different voltages on R3/R4 and R5/R6 are a prove that something is wrong in the circuit. Am I right? These voltages were measured with desoldered lm317 and lm337. Voltages are different also on the inputs of lm's. I'm waiting for rectifier diodes and filter capacitors to change them -...- sobol
- Post #1,012
- Forum: Headphone Amps (full-size)
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The "Lovely Cube" Headphone Amp (Lehmann Black Cube Linear Clone)
Everything is grounded well and hum is still there. Nevermind, I'll try to do something with it.- sobol
- Post #1,010
- Forum: Headphone Amps (full-size)
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The "Lovely Cube" Headphone Amp (Lehmann Black Cube Linear Clone)
Lm317 was dead. Now all works. I had some problems with a huge offset (about 200mV) on the output, but I've reduced it with a trimpot to about 10mV. Now the most annoying thing is hum. It's quite loud and in my opinion its caused by a pot and resistors (poor chinese quality like all parts - a...- sobol
- Post #1,008
- Forum: Headphone Amps (full-size)
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The "Lovely Cube" Headphone Amp (Lehmann Black Cube Linear Clone)
No, it worked before resoldering the power section.- sobol
- Post #1,005
- Forum: Headphone Amps (full-size)
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The "Lovely Cube" Headphone Amp (Lehmann Black Cube Linear Clone)
Maybe someone can help me. I've bought a kit, soldered it, then turn it on and... it works. But. A DC offset on output was about 200mV on a first channel, and 5V on the second channel. I've checked opamps Vcc and it also wasn't correct. So i've resoldered a "power" section of the BCL and there...- sobol
- Post #1,003
- Forum: Headphone Amps (full-size)