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We found this circuit in a PE Hobbyst Handbook from the 90s. The components are common, except the Geiger tube. The transformer is also a component that requires care when choosing.
This General Electric circuit was published in 1970. The LED is infrared and the voltage according...
With an 18 V input, this regulator was found in Philips documentation from the 60's. The...
Found in a 90s Silicon Chip documentation, this circuit provides a current of 3 A and the voltages...