Hello,
A quick look tells me that the 555 and 358 are powered by the 78L05.
That way the mosfets will not be driven hard enough to work cool.
Replace the 78L05 with an 78L10 and see if that changes the heat production.
https://eu.mouser.com/ProductDetail/STMicroelectronics/L78L10ACUTR?qs=YNC6WXvLPRbYRGEhI8BGOQ==
Also add an 330 nF capacitor on the C1 spot, wich is empty now.
Bertus
A quick look tells me that the 555 and 358 are powered by the 78L05.
That way the mosfets will not be driven hard enough to work cool.
Replace the 78L05 with an 78L10 and see if that changes the heat production.
https://eu.mouser.com/ProductDetail/STMicroelectronics/L78L10ACUTR?qs=YNC6WXvLPRbYRGEhI8BGOQ==
Also add an 330 nF capacitor on the C1 spot, wich is empty now.
Bertus