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Inside the Siglent SPD3303X Precision Programmable DC Lab Power Supply.
http://amzn.to/1m9Knp2
UPDATE: There is an even cheaper version, the SPD3303X-E which has 10mV/10mA resolution.
http://amzn.to/1jNsQRL

Atten PSU teardown:    • EEVblog #440 - Atten PPS3205T-3S Trip...  
Rigol DP832 teardown:    • EEVblog #511 - Rigol DP832 Power Supp...  

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