Wiktor Wise
Reprogramming an electric music card can be a challenging task and may not always be possible. The complexity of the process depends on the specific type of card and its internal circuitry. Some cards may have chips that are not reprogrammable, while others may offer the ability to change the audio or musical content. One method to reprogram a music card is to use a microcontroller IC, which can be purchased for a low price and used to record a short snippet of audio. Circuit bending is another approach, where the circuits within the card are modified to create unique musical or visual instruments. This involves adding wires, knobs, and switches to control new connections within the device's pre-existing circuit. Additionally, some cards may use photoresistors or light exposure to trigger the playback of audio. Before attempting any reprogramming, it is essential to have a good understanding of the card's underlying design and circuitry.
| Characteristics | Values |
|---|---|
| Possibility of reprogramming | May not be possible to reprogram a chip on an existing card |
| Alternative to reprogramming | Get unprogrammed modules that can be programmed with a one-time greeting |
| Circuit bending | Modifying existing electronics to create unique musical or video instruments by adding wires, knobs, and switches |
| Simple digital devices | The clock is a resistor-capacitor subcircuit which can be hijacked with a potentiometer to speed up or slow down audio playback |
| Easiest mechanism to trigger recorded voice | Using a photoresistor as exposure of the circuit to light should initiate playback |
| Cheaper option | ATtiny85 can be used to create the circuit with an LDR and program to run the file once after exposure to light |
| Arduino | A readymade printed greeting card (COB) with embedded melodies that need transistors to complete the circuit |
| ISD | Original "chip corders" developed by Richard Simko that could record 20 seconds of the analogue signal |
| ISD1820PY | Can record and playback audio |
| IC UM66 | Music-generating component with BC547 transistor |
| Microcontroller IC | Can be used instead of Arduino to record a small snippet of a song |
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What You'll Learn
- Circuit bending: Modify existing circuits to create unique instruments
- COB cards: Readymade cards with embedded melodies
- Arduino: An easy way to create your own musical greeting card
- Chip alternatives: Use a microcontroller IC to record a song snippet
- Clock subcircuit: Hijack and control the device's clock for faster/slower playback
Circuit bending: Modify existing circuits to create unique instruments
Circuit bending is a creative process that involves modifying the circuits of electronic devices to create unique musical or video instruments. This process was pioneered by Reed Ghazala, who coined the term "circuit bending" in 1992, although he first discovered the technique in 1967. Ghazala's work built on earlier experiments by Serge Tcherepnin and Thaddeus Cahill, who also explored the manipulation of electronic devices to create music.
Circuit bending often involves short-circuiting and modifying electronic toys or devices, such as keyboards, guitar effects units, or inexpensive musical instruments, to produce new and unique sounds. This can be done by adding wires, knobs, and switches to control new connections within the device's pre-existing circuit. Circuit benders may also solder and manipulate the circuits to create new sounds.
Circuit bending is a chance-based process that involves playing around with the circuits to explore the diverse effects that can be achieved. For example, circuit benders can investigate the effects of delay lines, slowed-down samples, and self-sustaining sounds from complex feedback systems. One simple technique involves identifying the clock subcircuit within a device and using a potentiometer to control the speed of audio playback, resulting in either faster ("chipmunk-style") or slower ("demon-voice-style") playback.
Circuit bending has gained a dedicated following, with a growing number of circuit-bent music channels and groups on the internet. It has also inspired books, such as "Circuit-Bending: Build Your Own Alien Instruments," which provide instructions on the tools and techniques of circuit bending and encourage readers to create their own unique instruments.
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COB cards: Readymade cards with embedded melodies
COB cards, or Chip-on-Board cards, are a type of readymade card that contains embedded melodies or other audio. These cards are commonly used as greeting cards or corporate flyers and typically operate on a simple circuit with a resistor-capacitor subcircuit. The COB itself usually has three terminals: positive, negative, and output. These cards are designed to work at 3 volts DC and may require additional circuitry if the supply voltage is higher.
While it may not be possible to reprogram the chip on an existing COB card, you can certainly purchase unprogrammed modules that can be customised with your own audio. The process of modifying these cards is known as circuit bending, which involves creatively customising the circuits within electronic devices to produce unique musical or visual effects. Circuit bending can be applied to a variety of devices, including children's toys, guitar effects units, and inexpensive musical instruments.
To reprogram a COB card, you would need to identify the type of memory used in the chip. If the chip contains an EEPROM (Electronically Erasable Programmable Read-Only Memory), you can change the audio with the appropriate software. However, if the chip uses UVEPROM (Ultraviolet Erasable) technology, it cannot be reprogrammed.
When creating your own musical greeting card, you can easily source tiny musical chips and connect them to ordinary electronic parts with a button cell. This allows you to design custom cards with your desired melodies or audio. It is important to note that working with electronics requires knowledge and experience to ensure safety and functionality.
Additionally, you can modify the audio playback speed of simple digital devices, such as greeting cards, by locating the clock subcircuit and using a potentiometer to control the device's clock. This manipulation of the clock subcircuit can result in faster or slower audio playback, creating unique audio effects.
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Arduino: An easy way to create your own musical greeting card
Greeting cards with music are a fun way to celebrate any occasion, but what if you want to personalise the music or message? You can create your own musical greeting card using Arduino, an easy and versatile platform for electronic projects. Here's a step-by-step guide to making your own musical greeting card.
Step 1: Understanding the Basics
Musical greeting cards typically consist of a simple circuit with a power source, such as a small battery, a switch, and a small speaker. The circuit is designed to play a pre-recorded message or song when the card is opened, activating the switch.
Step 2: Choosing the Right Components
To create your own musical greeting card, you'll need to select the appropriate components. You can use a cheaper microcontroller like the ATtiny85, or opt for an Arduino board. You'll also need a small speaker, a battery, and a switch. Additionally, consider using an LDR (Light-Dependent Resistor) to trigger the audio when the card is opened, as light exposure will initiate playback.
Step 3: Programming Your Audio
The next step is to program your audio file. You can record your own message or choose a short music clip. Arduino provides an easy way to program and play audio files. If you're using a microcontroller, ensure it has enough memory to store your audio. You can also explore using IC UM66 as the music-generating component with a BC547 transistor.
Step 4: Assembly and Testing
Now it's time to assemble your circuit. Carefully solder the components together, following a guide or schematic. Once assembled, test your circuit to ensure it works as intended. You may need to adjust the volume or playback speed to get the desired effect.
Step 5: Customisation and Decoration
Finally, customise your greeting card by adding your chosen design and decorations to the card. Ensure that the switch mechanism still functions correctly after adding your creative touches. Your musical greeting card is now ready to surprise and delight the recipient!
Creating your own musical greeting card with Arduino allows you to add a unique and personal touch to your celebrations. While it requires some technical knowledge and soldering skills, the process can be enjoyable and rewarding, resulting in a one-of-a-kind creation.
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Chip alternatives: Use a microcontroller IC to record a song snippet
Reprogramming an electric music card can be done in several ways, depending on the desired outcome and the complexity of the project. One approach is to use a microcontroller IC to record a song snippet, which offers flexibility and customization options.
When using a microcontroller IC, there are a few considerations to keep in mind. Firstly, the playback length of the song snippet will depend on the memory capacity of the microcontroller. For longer playback, a high-end microcontroller with greater memory capacity or an external flash chip is recommended. Additionally, the audio quality of the recording should be considered. Converting the recording to an 8-bit PCM file will allow for longer playback duration, but the audio quality will be compromised.
To load sounds into a microcontroller, you can explore different methods. One approach is to use an SD card to store the audio file, which can then be played through a speaker connected to the microcontroller. Another method is to save the audio file in a specific format, such as *.wav (8-bit, 8 kHz, mono, 7kb/s), and store it in EEPROM, allowing direct playback through a speaker.
It's important to note that using a microcontroller may not always be the most cost-effective option, as it often requires additional hardware and programming knowledge. An alternative is to use dedicated sound record/playback modules, which are small, cheap, and specifically designed for this purpose.
If you're interested in modifying an existing electric music card, circuit bending is a creative technique that involves customizing the circuits within electronic devices. This can be done by adding wires, knobs, and switches to control new connections within the device's pre-existing circuit, resulting in unique musical or visual instruments.
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Clock subcircuit: Hijack and control the device's clock for faster/slower playback
Circuit bending is the art of modifying existing electronics to create unique musical or video instruments. This can be done by adding wires, knobs, and switches to control new connections within the device's pre-existing circuit.
The type of circuit bend used to reprogram an electric music card is called a clock bend. All digital devices have a clock, which acts like a metronome that sends start and stop signals to the circuit. On simple digital devices, like common audio greeting cards, the clock is a resistor–capacitor subcircuit.
To reprogram an electric music card, you must first identify where the clock subcircuit is within the circuit. Once located, you can hijack it with a potentiometer. This will give you control over the device's clock, allowing you to speed up or slow down the audio playback.
To achieve complete speed control of the card's audio, you can attach clip leads to specific points on the circuit board. One method is to attach one end of a clip lead to the leg on the ground side of the capacitor and the other end to the pot’s left terminal. You can then set the potentiometer to halfway and start the card’s audio file.
It's important to note that some electric music cards may not be reprogrammable, especially if they use UVEPROM or PROM chips. However, you can purchase unprogrammed modules that you can program yourself. Additionally, you can explore other methods such as using Arduino modules or creating your own musical greeting card circuit.
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Frequently asked questions
You can reprogram an electric music card by identifying the clock subcircuit and hijacking it with a potentiometer. This allows you to control the speed of audio playback.
Circuit bending is the art of modifying existing electronics to create unique musical or video instruments. This is done by adding wires, knobs, and switches to control new connections within the device’s pre-existing circuit.
You will need the right software to reprogram the card. You may also need a microcontroller IC to record a snippet of a song.
The easiest way to reprogram an electric music card is to use a photoresistor. A photoresistor triggers the recorded voice when the circuit is exposed to light.
