The 501 is a single slot, 500 series compatible case and power supply.
FREE
Get a FREE component bender for resistors, diodes, inductors with your first module order.
The SK25 is a discrete Op-Amp that is pin compatible with the 2520 and "99" DOA's.
The SK99 is a discrete Op-Amp that is pin compatible with the 2520 and "99" DOA's.
This screwdriver has a recessed head at one end which prevents it from sliding off the trimmer potentiometre head you are adjusting. Very convenient when you are working inside your lunchbox.