Figure 144 in the book shows the schematic diagram for our d.i.y. thermoelectrically cooled single-photon avalanche photodiode (SPAD). Our design calls for a ThermOptics DN1225 TEC controller. However, this model is not available any more. Fortunatelly, the ThermOptics’ DN1221 subminiature Bipolar Temperature Controller for Thermoelectric Coolers (TEC) is equally suitable by adapting the pinout and adjusting component values.
This TEC controller is designed to operate with a negative temperature coefficient (NTC) thermistor that senses the temperature of the SPAD attached to the TEC. Temperature is set with a user selected resistor. Temperature stability of 0.01°C is achieved by the linear PI control loop of the DN1221.
Click here for the DN1221’s datasheet.
ThermOptics’ website: www.thermoptics.com