The 1122 is a high performance direct coupled operational amplifier designed specifically for professional audio amplifier applications, which include:

• Microphone preamplifier where source impedance is between 7k ohm- 20k ohm for noise index below 1 dB
• Line output amplifier for driving up to loads of 75 ohm
• Active filters (equalizer circuits)
• Summing amplifier

Features:

- Low noise
- High output power
- Low distortion
- Wide power bandwidth
- Standard footprint
- Stable operation
- Electrostatically shielded
- Operation under wide voltage range

Price: $80.00

Sold Direct Only. Please email first to purchase. Paypal accepted.

The 1122 was originally made for replacement opamps for the repair for the many older gear we've worked on, and was also used in custom made preamps and prototypes for our use.

The 1122 combines classic design with today's high quality choice of components to make it operatable with a wider voltage range and exhibit slightly lower noise than what was possible before. Using no IC's, no JFET's, and no surface-mount components, the 1122 is an evolution of where our favorite opamps from the past left off.

There has been some inquiry for using the 1122's in DIY projects. Learning is an ongoing process in the audio engineering field which we support. However, we cannot be responsible for damaged opamps due to improper application. Some things to check and consider in a DIY project are:

•Safety first - make sure you have ground connections and recheck everything involving AC. Be sure you have a properly rated fuse.
•Board layout for any trace problems. Keep high impedance traces as short as possible to minimize chances of induced noise.
•Check power supply voltages and make sure regulators are doing what they are designed to do. Study application notes.
•Check to make sure the opamps output is driving a transformer, or something it's designed to drive and not accidentally shorted to ground.
•Be mindful of your source impedance. This is part of what determines noise of the input stage and why not all opamps are "swappable"
•Check your paths around the opamp. Textbooks that specialize in opamps get into great detail about gain and feedback.

The 1122's pins come in length of about 1/2 inch so that they can be trimmed to size, whether plugged into a socket or soldered into place.