Blog 2018/7/8 (retroactively blogged on 2022/7/23)
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I prototyped out a couple of variations of temperature regulation circuits for a small voltage reference oven, based on the LM723 circuits of forum member "blackdog".
See the thread on the eevblog forums: https://www.eevblog.com/forum/metrology/small-oven-controler-for-voltage-reference/msg1656827/#msg1656827