This circuit was obtained from Radio Electronics magazine, October 1987. The circuit uses a triac to control the heating element current. The transistors are general purpose.
This circuit was obtained in a manual of the used old operational amplifier. However, the same...
Other series amplifiers such as the MC3301, MC3401 and LM2900 can be used on this circuit. We...
The circuit is from an 80's publication, but the components are current, only special type diodes...