# Current Sources

A current source is a type of electronic test equipment in circuit form that can deliver or absorb electrical current that’s independent of the voltage across its terminals. There are two types of current sources: dependent and independent. A dependent current source delivers an electric current that is proportional to another voltage in the circuit. An independent current source delivers a constant current. Engineers use new, used, and refurbished current sources to evaluate precision circuits.

## Products in this collection

- [Keithley 6221 - Current Source - New](https://valuetronics.com/products/6221-keithley-current-source-new) - 10300.0 USD
- [6220 Keithley Current Source New](https://valuetronics.com/products/6220-keithley-current-source-new) - 7630.0 USD
- [220 Keithley Current Source Used](https://valuetronics.com/products/220-keithley-current-source-used) - 0.0 USD
- [ILX Lightwave LDX-3620 Ultra-Low Noise Current Source (Pre-Owned)](https://valuetronics.com/products/ldx-3620-ilx-lightwave-current-source-used) - 0.0 USD
- [6220 Keithley DC Precision Current Source Used](https://valuetronics.com/products/6220-keithley-dc-precision-current-source-used) - 0.0 USD
- [9269-10 Hioki Current Source New](https://valuetronics.com/products/9269-10-hioki-current-source-new) - 980.0 USD
- [9269 Hioki Current Source New](https://valuetronics.com/products/9269-hioki-current-source-new) - 842.0 USD
- [83437A Agilent Current Source Used](https://valuetronics.com/products/83437a-agilent-current-source-used) - 0.0 USD
- [6221 Keithley Current Source Used](https://valuetronics.com/products/6221-keithley-current-source-used) - 0.0 USD
- [CSM-39020 ILX Lightwave Current Source Module Used](https://valuetronics.com/products/csm-39020-ilx-lightwave-current-source-module-used) - 0.0 USD
- [6181C Agilent Current Source Used](https://valuetronics.com/products/6181c-agilent-current-source-used) - 295.0 USD
- [228 Keithley Current Source Used](https://valuetronics.com/products/228-keithley-current-source-used) - 995.0 USD
- [42841A Agilent Current Source Used](https://valuetronics.com/products/42841a-agilent-current-source-used) - 0.0 USD
- [6140A Agilent Current Source Used](https://valuetronics.com/products/6140a-agilent-current-source-used) - 0.0 USD
- [225 Keithley Current Source Used](https://valuetronics.com/products/225-keithley-current-source-used) - 0.0 USD
- [6177C Agilent Current Source Used](https://valuetronics.com/products/6177c-agilent-current-source-used) - 0.0 USD
- [228A Keithley Current Source Used](https://valuetronics.com/products/228a-keithley-current-source-used) - 0.0 USD
- [224 Keithley Current Source Used](https://valuetronics.com/products/224-keithley-current-source-used) - 3195.0 USD
- [227 Keithley Current Source Used](https://valuetronics.com/products/227-keithley-current-source-used) - 0.0 USD
- [1320 QuadTech Current Source Used](https://valuetronics.com/products/1320-quadtech-current-source-used) - 8395.0 USD

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> Source: [ValueTronics](https://valuetronics.com/collections/power-supplies-loads-current-source)
> Updated: 2026-06-03