SSLV1.1 builds & fairy tales

[stajo]

Yup. Got a sinus and a sawtooth 800 mV on left and then right input. Rails didnt move.

 

[Salas]

Common mode noise can intrude rails. Oscillation is not random, its periodic as created by self instability. Looks like a crooked sine or a bad triangle. A scope triggers on it and you won't miss if it ever appears riding on the rails of your equipment.

 

[Salas]

Tell tale signs of oscillation in equipment are buzzing, whistling, weak signal, hard to explain heat.

 

[stajo]

Bit OT but I need to solder up some short RCA cables. How do we like RG58u?

 

[Salas]

If you haven't got some microphone cable like Canare, Mogami etc. RF cable like RG comes handy.

 

[Salas]

Ground pollution it was Yoda says. Disappeared with 200 kHz bandwith limiter. Probe on negative rail
View attachment 1307361

View attachment 1307365

Short ground needle accessory on naked nose probe helps picking less interference than with probe's neck ground return crock wire. Due to much less inductance and narrow loop area very near to nose pin.