Table 1. Zinc/ Copper Lemon Cells wired in series

(zinc and copper electrodes placed 2.0 cm apart; each lemon cell 0.96-0.98V; 240 mA current.)

Item	Catalog number (Radio Shack¨)	Minimum # of lemons in series	Best results
Red Wide-Angle LED	276-203	3	4
PC Board Mount Piezo Buzzer	273-074	2	2
Red Blinking LED	276-036 C	2	3
Green Blinking LED	276-030	2	3
Red Jumbo LED	276-214	2	4
Low-Current Red LED	276-044	3	4
Piezo Buzzer, 3.5 kHz	273-060	2	2
Pulsing Piezo Buzzer, 2.8 kHz	273-066	2	4
PC Board Mount Piezo Buzzer, 2.8 kHz	273-065	2	2
Piezo Buzzer, 2.7 kHz	273-059	2	2
Stick-on LCD Clock/ Calendar/Timer	63-840A	2	2
LCD Travel Alarm Clock	63-723	2	2
LCD Desktop Clock	63-729	2	2
Texas Instruments TI-30X calculator		3	4

Table 2. Magnesium/ Copper Lemon Cells wired in series

(magnesium and copper electrodes placed 2.0 cm apart; each lemon cell 1.5-1.6V; 400 mA current.)

Item	Catalog number (Radio Shack¨)	Minimum # of lemons in series	Best results
Red Wide-Angle LED	276-203	1	3
PC Board Mount Piezo Buzzer, 3.2 kHz	273-074	1	2
Red Blinking LED	276-036 C	2	3
Green Blinking LED	276-030	2	3
Red Jumbo LED	276-214	2	3
Low-Current Red LED	276-044	1	3
Piezo Buzzer, 3.5 kHz	273-060	1	2
Pulsing Piezo Buzzer, 2.8 kHz	273-066	2	2
PC Board Mount Piezo Buzzer, 2.8 kHz	273-065	1	2
Piezo Buzzer, 2.7 kHz	273-059	1	2
Stick-on LCD Clock/ Calendar/Timer	63-840A	1	1
LCD Travel Alarm Clock	63-723	1	1
LCD Desktop Clock	63-729	1	1
Texas Instruments TI-30X calculator		2	3

[return].