Oscillators Circuit DiagramsSignal Generators

Simple Delta Wave Generator Schematic Circuit Diagram

Simple Delta Wave Generator:

A delta wave, scientifically known as delta rhythm, represents the typical brainwave pattern evident in an electroencephalogram (EEG) during deep, dreamless sleep. It is characterized by high voltage and low frequency, typically within the range of 1 to 4 Hz. If you’re contemplating the creation of a system to stimulate brain activity, whether for academic, amateur, or professional electronics projects, this circuit, centered around an affordable CMOS chip, is tailored to your requirements. This compact battery-powered circuit can function as a versatile delta wave generator, potentially aiding individuals dealing with chronic insomnia, a persistent sleep disorder.”

Delta Waves & Cranial Electrotherapy Stimulation

Delta waves represent the slowest brainwave patterns observed in humans. They are most commonly present in infants and young children and tend to decrease as we age, even during deep sleep. These waves are closely associated with the deepest levels of relaxation and restorative, healing sleep. Additionally, they play a role in unconscious bodily functions, including the regulation of heartbeat and digestion. The sufficient production of delta waves is crucial for waking up feeling completely rejuvenated after a good night’s sleep. When there is abnormal delta wave activity, it may lead to learning difficulties or challenges in maintaining conscious awareness.

Cranial electrotherapy stimulation (CES) is a therapeutic technique that involves the application of very low levels of electrical stimulation to the head to treat conditions such as anxiety, depression, insomnia, and chronic pain. CES is a relatively uncomplicated treatment method that employs a small, battery-powered device resembling the size and appearance of transcutaneous electrical nerve stimulation (TENS) devices commonly used in physical therapy for pain relief. However, CES generates distinct waveforms at significantly lower current levels. The CES device delivers pulses of extremely low amperage (typically less than 1 mA) through thin wires connected to electrodes placed on the earlobes or affixed to the skin over bony prominences just in front of or behind each ear. The frequency of these electrical pulses can be adjusted, typically ranging from 0.5 Hz to 100 Hz, depending on the desired therapeutic effect.

Simple Delta Wave Generator Schematic Circuit Diagram 1

Simple DIY CES Device

This serves as an introductory or demonstration model of a variable frequency CES (cranial electrotherapy stimulation) device, which is designed with enhanced safety compared to numerous other concepts available online. This particular device is set up as a delta wave generator, intended to assist individuals dealing with chronic insomnia. It produces a well-defined, symmetrical bipolar square wave with a frequency slightly below 1 Hz.

Simple Delta Wave Generator Schematic Circuit Diagram 2

As evident from the circuit diagram, the core of this device relies on a cost-effective CD4069 (IC1), which is configured as a straightforward RC feedback oscillator. This configuration utilizes the initial two gates of the IC1 (IC1A-IC1B). The specific values of components R1, R2, R3, and C3 collectively determine the operating frequency. For further precision in frequency adjustment, a 4.7-Multi-turn preset potentiometer (RP1) is available for fine-tuning. Similarly, the intensity of the output pulses, accessible through terminals P1 and P2, is regulated by a 10K Multi-turn preset potentiometer (RP2). A red lamp (LED1) is employed as an indicator to denote the device’s operational status, indicating whether it is running or stopped. The entire device can be powered using a 6-V (achieved through four 1.5-V batteries) supply.

Schematic Circuit Diagram 3

Did You Know?

For over four decades, CES (cranial electrotherapy stimulation) has been employed as a non-pharmaceutical therapy, akin to acupuncture but without the use of needles, in numerous countries worldwide. This particular design serves the purpose of delivering a modifiable tingling sensation to your earlobes, aiding in the equilibrium of neurotransmitters. It aims to help you achieve a state of relaxation and enhanced capability for various activities, such as work, play, meditation, concentration, or sleep, at your convenience and in any location you choose.

Schematic Circuit Diagram 4

Notes & Warnings

• A true RMS digital ac voltmeter is necessary to adjust the output intensity (output voltage). Similarly, a precise digital frequency counter is essential for calibration of the output frequency. However, with a CRO/DSO, it is possible to carry out these two tasks efficiently.
• In my prototype, a 100-uF/25-V capacitor (C2) is connected across the 100-n capacitor (C1). Later, it’s removed and, thus, you can’t see a capacitor labelled as C2 in the presented circuit diagram.
• The 33-n capacitor (C4) helps prevent ringing and unwanted noise injection on the outputted square waves. Another good value for this capacitor is 39 n.
• Although I have successfully built and tested this design, performance is not warranted. I hold no responsibility; hence, use the device at your own risk. Those who are epileptic, pregnant, or have a pacemaker (or any other bioelectric device) should consult their doctor before use!


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