In most Japanese audio amplifiers exist fairly simple secondary power supply for phono stages and preamps .
---The basic one transistor with a network of resistors to define base control and output voltage no stabilization , but stable enough for the specific load
---Variation of the above including slow turn on capacitor
---then a zener controlled transistor as is, or with slow turn on circuit
---then you have variations that include slow turn on but with feedback from the output or other stages to preserve stability and often safety measures like case of overvoltage ( like transistor is shorted ) and so on
Would one care to comment or summarize the choice in terms of noise or in general why like this and not like that ???
Farther more would a regulator of the known families78xx 317-337 will work better or worst in such an application ???
Kind regards
Sakis
---The basic one transistor with a network of resistors to define base control and output voltage no stabilization , but stable enough for the specific load
---Variation of the above including slow turn on capacitor
---then a zener controlled transistor as is, or with slow turn on circuit
---then you have variations that include slow turn on but with feedback from the output or other stages to preserve stability and often safety measures like case of overvoltage ( like transistor is shorted ) and so on
Would one care to comment or summarize the choice in terms of noise or in general why like this and not like that ???
Farther more would a regulator of the known families78xx 317-337 will work better or worst in such an application ???
Kind regards
Sakis