I made a PCB layout of Bill Christie's Phono Preamplifier. The original article can be found at
You Can DIY! Build an External Phono Preamplifier | audioXpress
https://audioxpress.com/assets/upload/files/BillChristieExternalPhonoPreampAXJul2013.pdf
The changes made are as follows. The LME49740, which is not available anymore, has been replaced with two LM4562 op amps. 22 pF Miller capacitors are placed to stabilize the LM4562 from oscillation. The signal grounds for the two channels are isolated from the power ground by hum breaker resistors.
You can find the PCB in the github project
GitHub - profdc9/PhonoPreAmp: A Phono Preamp Based on Bill Christie's design
Enjoy, Dan
You Can DIY! Build an External Phono Preamplifier | audioXpress
https://audioxpress.com/assets/upload/files/BillChristieExternalPhonoPreampAXJul2013.pdf
The changes made are as follows. The LME49740, which is not available anymore, has been replaced with two LM4562 op amps. 22 pF Miller capacitors are placed to stabilize the LM4562 from oscillation. The signal grounds for the two channels are isolated from the power ground by hum breaker resistors.
You can find the PCB in the github project
GitHub - profdc9/PhonoPreAmp: A Phono Preamp Based on Bill Christie's design
Enjoy, Dan
