The Thick Flick is an original op amp design inspired by Flickinger 290-3 mic preamp cards. It can be used in all traditional audio amplifier configurations.
The design is very different from most discrete op amps – it uses two differential pairs for the input and voltage amplification stage, followed by an all NPN output stage. The design is simple and elegant. We cleaned it up a bit, selected modern transistors, and adjusted it for unity gain stability – so you can plug it in anywhere!
We really love it as a mic pre. The top end opens up in a really nice way from the beautiful harmonics it generates.
Gain >90 dB DC, >50 dB at 20kHz
Input Impedance >20 MΩ DC, >3 MΩ at 20kHz
Unity gain bandwidth 9.4 MHz
Slew Rate 2.2 V/μS
Common Mode Rejection Ratio 80 dB min.
THD (G = 1, f = 1 kHz, Vo = 3 Vrms RL = 600Ω) <0.001%
Headroom (THD<0.01%, f = 1 kHz, RL = 600Ω) >24 dBu
Input Voltage Noise density (f = 1 kHz) 2.2 nV/√Hz
Current Noise density (f = 1 kHz) 0.10 pA/√Hz
Input Noise Voltage (f = 20 Hz to 20 kHz) 0.32 μVrms
Quiescent Current <50 mA at +/-24 VDC supply
Short-circuit output current 80 mA
Power supply voltage Bipolar, +/-12VDC to +/-24 VDC