Page 7
Copyright
2008 FiveFish Studios
www.fivefishstudios.com
SC-1mk500 Microphone Preamp Kit
Integrated Circuit (IC) Chips
IC1
IC1 is a THAT1510 Preamp IC. It has low noise characteristics, and an even lower noise at low gains, wider bandwidth, higher
slew rate, lower distortion, and lower supply current.
You can substitute a THAT1512 chip for IC1, bringing down the gain selection from +6dB to +66dB. The 1512 chip was also
tested and found to work the SC-1mk500 preamp.
It is also pin-compatible for use with SSM2019/SSM2017/INA217/INA163. However, performance and functionality was not
tested with these older SSM/INA chipsets.
IC2, IC3
IC2 is a Burr-Brown OPA2134 chip. This is another ultra-low distortion, low noise chip designed for audio applications. This FET-
input chip has high output drive capability, excellent DC performance and wide output swing, capable to /- 1V of the
power supply voltage, which allows increased headroom. IC2 is used as a DC Servo in the SC-1mk500 Mic Preamp Design.
IC3 is also an OPA2134 chip. But this chip is used as a buffer before the TRIM potentiometer and after the potentiometer. This
also serves as a buffer before/after the SEND/RETURN insert pads.
IC4
IC4 is a THAT1646 Balanced Line Driver output. Using OutSmarts technology, this chip is stable driving long cables and
capacitive loads and is also capable of high output (18Vrms into 600 ohms according to manufacturer). Just like the Mic preamp
chip, and the DC servo chip, this chip has low noise, low distortion, high slew rate and wide output swing.
Above is a photo showing the locations of IC1, IC2, IC3 and IC4. Note the proper orientation of the chips.
The green dot in the photo above marks the location of PIN 1 of the IC chip. There is also a notch on the IC body to show the
proper orientation of the IC chips.
