Build Files.

This is a replacement board for the uA726 heated pair which was used in many synthesizers by manufacturers such as Roland, Moog and Korg.

It is a temperature-compensated voltage regulator for a dual monolithic transistor pair. The circuit combines an IC voltage regulator and an IC with four transistors. This design achieves a temperature coefficient of -3.1 ppm per degree Celsius between 33°C and 50°C. A potentiometer is used to set a temperature reference voltage. This reference voltage is compared with the voltage from a chip-temperature sensor transistor. The resulting difference voltage is then applied to a chip heater transistor via an error amplifier. This process helps to maintain a constant temperature for the transistor array, resulting in increased linearity and oscillator performance.