a duel polarity power supply in LTSPICE

[MrDEB]

Need a Howland constant source grounded load as well as a duel polarity power supply with a ground.
Going to use 7805 and 7905 on the 12v outputs of attached circuit but how to compute current available at outputs?
Using LM324 op amps
don't want to use a CT transformer as I have a 24v transformer w/o a CT (using from existing temp soldering iron)

 

[alec_t]

Why not use LTS to compute the current available, using dummy loads? I see you have a .step command with a parameter R, but where is {R} on the schematic? Ultimately, current available will depend on what your tranny can provide and on how much ripple you can tolerate on the caps.
BTW, why not use a bridge rectifier? As shown there is only half-wave rectification and one of the diodes is superfluous.

 

[MrDEB]

The schematic was copied from another post and failed to remove all of not wanted components.
LTS and dummy loads?
Not real familiar with LTspice but learning something every time I use it.

 

[alec_t]

Stick with LTS. It's a steep learning curve. Just add varying load resistors to your sim supply and monitor how the reservoir cap voltage is affected.

 

[MrDEB]

Going a different direction by using an LM317 for a constant current source