Probably no disadvantage, even if you don't decouple the HT between the stages. However, with more then two stages there is a risk of positive feedback between the 1st and 3rd stages, which can lead to LF instability (motorboating). It's normal practice to decouple the HT for every stage.
I seem to remember reading that capacitance in uF x resistance in ohms/1,000,000 should be 0.1 or greater, for good decoupling.
So, from this rule of thumb, if you want a small voltage drop and use e.g. a 470 ohms resistor, the minimum capacitance you need = 1,000,000x 0.1/470 = approx. 220uF.
So, from this rule of thumb, if you want a small voltage drop and use e.g. a 470 ohms resistor, the minimum capacitance you need = 1,000,000x 0.1/470 = approx. 220uF.
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.