and or until the electronic device 20 is removed from the receptacle 60 as illustrated in fig4 a and 4b the lockout mechanism 70 is connected to the link plate 52 and operated by movement of the link plate 52 as the support legs 30 are moved between the retracted and extended positions as shown for example in fig4 a the lockout mechanism 70 includes a stopper 72 which extends into the receptacle 60 i e through aperture 62 when the support legs 30 and deployment mechanism 50 are in the retracted position fig4 a thereby preventing insertion of the electronic device 20 when the support legs 30 are moved into the extended position as shown in fig4 b the corresponding movement of the link plate 52 displaces the stopper 72 to a position outside of the receptacle 60 allowing the electronic device 20 to be inserted furthermore the presence of the electronic device 20 in the receptacle 60 prevents the stopper 72 from reentering the receptacle 60 and as result prevents retraction of the support legs 30 as long as the electronic device is inserted as shown in fig5 the support stand 10 can also include electronics 80 mounted on two circuit boards 81 and 83 for example an audio control circuit an amplified and or an equalizer to be used with the electronic device 20 the control electronics 80 can include an electrical connector 82 shown in fig2 b disposed at.