• Paese
• USA (Stati Uniti d'America)

• Produttore / Marca
• Hewlett-Packard, (HP); Palo Alto, CA

• Anno
• 1975–1978

• Categoria
• Elaborazione di segnali e strumenti di calcolo (Computer e moduli SP)

• Radiomuseum.org ID
• 305084

Clicca sulla miniatura dello schema per richiederlo come documento gratuito.

• Gamme d'onda
• - senza

• Tensioni di funzionamento
• Batteria di accumulatori, per tutto (es. autoradio, radio amatoriali) / NiCd: 2 x 1.2 Volt

• Altoparlante
• - - Nessuna uscita audio.

• Materiali
• Plastica (non bachelite o catalina)

• Radiomuseum.org
• Modello: Electronic Pocket Calculator HP-21 - Hewlett-Packard, HP; Palo Alto

• Forma
• Tascabile (portatile molto piccola), < 20 cm

• Dimensioni (LxAxP)
• 68 x 28 x 130 mm / 2.7 x 1.1 x 5.1 inch

• Annotazioni

• Introduced in 1975, the HP-21 (codenamed Pumpkin) is a basic 30-key scientific calculator that replaced the HP-35. It has the same functions as the HP-35 plus controlled display formatting, polar/rectangular conversion, radian mode in trigonometric calculations, and storage arithmetic.

  RPN logic, 4 level stack.
  10-digit precision.
  11-digit plus sign LED display. The decimal point is integrated in the digits instead of taking up one digit position, as in the HP-35. The exponent sign and digit share space with the mantissa when required.
  Fixed and scientific number format, selectable by the DSP key.
  Storage arithmetic with dedicated keys (using shift).
  Slide switch selection of degrees or radian mode.

  Power 2.5v 500 mW.
  An internal 2-transistor blocking oscillator converter generates +6v and -12v for the MOS ICs and +4v for the LED display.

  Battery pack HP82019A/B contains 2 AA-size rechargeable NiCd batteries. The B model can hold batteries of slightly larger diameter than the A model.
  Spurious decimal points are displayed when the battery is low.

  Charger HP82024A.
  Input switch selectable 115v/230v AC.
  Output 10v AC 180 mA.
  (The charger only contains a transformer).

  The calculator can be operated from the charger, but as the batteries are necessary to clamp the supply voltage they must be present to avoid overvoltage.

  An HP82028A reserve power pack contains the rectifier diode and series resistor that allows an HP82019A/B battery pack to be charged outside the calculator using the HP82024A charger.

  Calculator and charger made in Singapore.

• Peso netto
• 0.170 kg / 0 lb 6 oz (0.374 lb)

• Prezzo nel primo anno
• 125.00 USD

• Autore
• Modello inviato da Bruce Taylor. Utilizzare "Proponi modifica" per inviare ulteriori dati.

• Altri modelli

• In questo link sono elencati 392 modelli, di cui 360 con immagini e 138 con schemi.
  Elenco delle radio e altri apparecchi della Hewlett-Packard, (HP); Palo Alto, CA