Kirlian Photography power supply
The CD4049 is a hex inverter that can be configured to operate as a multivibrator, generating square wave signals. In this application, the CD4049 outputs are connected to the bases of a Darlington pair, which consists of two bipolar junction transistors (BJTs) configured to amplify current. This arrangement allows for significant current gain, enabling the control of larger loads, such as a transformer.
The transformer (TR2) connected to the Darlington pair serves as the output stage of the circuit, converting the amplified signal into a high-voltage alternating current (AC) output. The frequency of the output AC can be varied by adjusting the resistor-capacitor (RC) timing network associated with the multivibrator configuration. This flexibility allows the circuit to be used in various applications requiring different AC frequencies and voltages.
To ensure stable operation, the circuit may include additional components such as diodes for flyback protection, capacitors for filtering, and resistors to limit current. Proper heat dissipation measures should also be considered for the Darlington transistors, as they can generate significant heat under load.
Overall, this configuration provides an efficient means to generate a variable-frequency AC supply suitable for various applications, including motor control, power supplies, and signal generation.CD4049 IC multivibrator circuit drives a Darlington connected transistor pair, which drives TR2, a transformer. This device is essentially a high-voltage variable-frequency ac supply.
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