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.)

ItemCatalog number (Radio ShackĘ) Minimum # of lemons in seriesBest results
Red Wide-Angle LED

276-20334
PC Board Mount

Piezo Buzzer

273-07422
Red Blinking LED276-036 C23
Green Blinking LED276-03023
Red Jumbo LED276-21424
Low-Current Red LED

276-04434
Piezo Buzzer, 3.5 kHz273-06022
Pulsing Piezo Buzzer,

  • 2.8 kHz
273-06624
PC Board Mount

  • Piezo Buzzer, 2.8 kHz
  • 273-06522
    Piezo Buzzer, 2.7 kHz273-05922
    Stick-on LCD Clock/ Calendar/Timer63-840A22
    LCD Travel Alarm

    Clock

    63-72322
    LCD Desktop Clock63-72922
    Texas Instruments

    TI-30X calculator

    34

    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.)

    ItemCatalog number (Radio ShackĘ) Minimum # of lemons in seriesBest results
    Red Wide-Angle LED

    276-20313
    PC Board Mount

    Piezo Buzzer, 3.2 kHz

    273-07412
    Red Blinking LED276-036 C23
    Green Blinking LED276-03023
    Red Jumbo LED276-21423
    Low-Current Red LED

    276-04413
    Piezo Buzzer, 3.5 kHz273-06012
    Pulsing Piezo Buzzer,

    2.8 kHz

    273-06622
    PC Board Mount

    Piezo Buzzer, 2.8 kHz

    273-06512
    Piezo Buzzer, 2.7 kHz273-05912
    Stick-on LCD Clock/

    Calendar/Timer

    63-840A11
    LCD Travel Alarm

    Clock

    63-72311
    LCD Desktop Clock63-72911
    Texas Instruments

    TI-30X calculator

    23


    [return].