Meng says the motor, thinner than a pencil, could be taken out and recharged every day or two, But, even better, he says, is " the use of eyeglasses to absorb some light, a photo cell to charge it, so you don't have to take it out ."
22.
Block diagram of PeH�z system with single control loop : F finger, L lamp, PC photo cell, S segments of transparent pressure cuff, C 1 average of PC-signal, DA difference amplifier, V ( PG ) plethysmographic signal, PID correcting network, C 2 set point SP, SW switch between open and closed loop, PA power amplifier, EPT electro-pneumatic transducer, M ( CP ) Pressure measured with Manometer . ( Constructed with respect to PeH�z original drawing ).
