Technical data

 

Click on the picture to see a preview of the pcb.

 

The pcb is tested with LT1115, LT1028, OPA627 and OPA134. Virtually any opamp fits if they have proper characteristics. If you are unsure, drop me a note and I can give my point of view.

 

Frequency response: 0 Hz - 2,5 MHz, -3 dB, LT1115
0 Hz - 1,0 MHz, -3 dB, OPA627
0 Hz - 1,0 MHz, -3 dB, OPA134
Frequency response with input filter 1,5 Hz - 338 kHz, -3 dB
Power bandwidth at 10 Vrms, 50 ohms: 0 Hz - 190 kHz, -3 dB, LT1115
0 Hz - 700 kHz, -3 dB, OPA627
0 Hz - 250 kHz, -3 dB, OPA134
Equivalent input noise: 100 nV, LT1115
600 nV, OPA627
1,2 µV, OPA134
Signal to noise ratio: 137 dB, LT1115
122 dB, OPA627
116 dB, OPA134
Dynamic headroom: 157 dB, LT1115
142 dB, OPA627
136 dB, OPA134
Distortion: < 0,0002 %, LT1115
< 0,00003%, OPA627
< 0,00008%, OPA134
Slew rate: 15 V/µs, LT1115
55 V/µs, OPA627
20 V/µs, OPA134
Step response: Perfect with a minor overshoot, LT1115
Perfect without overshoot, OPA627
Perfect without overshoot, OPA134
Gain: 11 (21 dB)
Input impedance: 47 kohms
Output impedance: 3 milliohms
Damping factor: 16000 with 50 ohms load
Output current: 1 A peak
Supply voltage: +- 18-33 V DC, 2 x 12-24 V AC
Current consumption: 100-200 mA idle, max 1,4 A, with headphones connected not more than the idle current.
Dimensions: 157,5 (6,2") x 142,2 (5,6") mm