Constant Current Circuits

Circuit Forms Constantcurrent SCR: 02/01/01 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit.

Circuit forms novel floating current source: 05/01/03  EDN-Design Ideas / Figure 1 shows a polarization circuit applicable to ISFET (ion-sensitive field-effect-transistor) sensors. ISFETs are solid-state chemical sensors that measure the pH value of a solution in biomedical and environmental applications, for example. The circuit in Figure 1 is extremely simple; it sets fixed-bias conditions for ISFET sensors (VDS=I0 RX; IDS=I0)....

Circuit Provides Constant Current for ISFETs/MEMFETs: 10/26/00 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit

Constant current Amplifier :

Constant Current Battery Charger:

Efficiently Source Constant Current To Low Resistance Loads : 06/23/03 Electronic Design - Ideas for Design / Supplying a constant current to a variable, low-resistance load, such as a thermoelectric cooler, can be a very inefficient endeavor when using the linear approach. Even powering the linear current source from an efficiently downconverted version of the supply voltage will incur unnecessary dissipation if the load resistance is variable