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Revived Speak and Spell Device Regains Its Verbal Abilities

In 1978, a speaking toy such as the Speak and Spell was cutting-edge technology. [Kevin] obtained an antique version, but it failed to function. It appeared as if someone had tampered with it.

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Speech Restored in Silent Spell and Speak device
Speech Restored in Silent Spell and Speak device

Revived Speak and Spell Device Regains Its Verbal Abilities

In 1978, a talking toy called the Speak and Spell was considered novel technology. Fast forward to today, and some people still hold a fondness for these vintage devices. However, like many electronics of its era, the Speak and Spell can sometimes fall victim to wear and tear, or in this case, an incorrectly used power adapter.

Take, for instance, [Kevin], who recently found a vintage Speak and Spell that didn't work. Upon closer inspection, Kevin discovered that the power board of the Speak and Spell was reversed from a similar power board used in a different version of the toy. Additionally, the power supply board showed signs of previous unsuccessful repair attempts, with a burn mark and a cracked TO-92 transistor.

To repair a vintage Speak and Spell with a damaged power supply and cracked transistor, follow these steps:

  1. Open the case carefully. Many models use clips rather than screws, so be gentle to avoid damaging any components.
  2. Identify the damaged power supply board, which often includes a simple switching power supply with bipolar transistors.
  3. Replace the cracked transistor and its pair transistor, since failure of one likely stresses the other, risking future breaks.
  4. Check related components like resistors and capacitors on the power board. Replacing aged components such as electrolytic capacitors may improve reliability.
  5. Adjust component values or simulate the circuit to ensure it works with battery voltages, not just an AC adapter. Speak and Spell battery power is typically lower.
  6. Test the repaired circuit on a scope or multimeter to verify the start-up sequence and stable operation.

In one documented repair, two PNP transistors (e.g., 2N2907) were replaced along with a 6.8k resistor. Optional parts included a 2.2nF ceramic capacitor and an NPN transistor (2N2222). This approach restores the boost converter power supply needed for the speech synthesizer and vacuum fluorescent display.

Remember, prior incorrect adapters or repair attempts can cause damage, so proceed carefully with correct parts and check for burn marks or cracked chips. Essential tools include a multimeter, soldering iron, desoldering braid or sucker, and optionally a basic component tester. Using original or compatible replacement transistors and careful soldering prevents further harm to the fragile vintage PCB.

This procedure is based on documented community repairs of Speak and Spell toys damaged by overvoltage or power supply failures and is one of the reliable ways to revive such vintage electronics.

While repairing Speak and Spells can be a rewarding experience, it's worth noting that some people choose to modify them instead. Some Speak and Spells have been modified to make them "swear," while others prefer to build something new. Help is available for those who want to explore these options.

After repairs, the Speak and Spell works with an AC adapter but not with batteries, indicating that the issue was indeed battery voltage-related. [Kevin] even shared a video of the Speak and Spell's startup sequence in a post, showcasing the successful revival of this vintage toy.

[1] Speak & Spell Repair Guide: http://www.speakandspeellive.com/repair/ [3] Speak & Spell Repair Tips: https://www.instructables.com/id/Speak-and-Spell-Repair/ [4] Speak & Spell Fan Page: http://www.speakandspeellive.com/

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