This source was found in Philips' 60s documentation. The transistors are from the era and the zener is 9 V. Modern transistors according to the current can be used. The output is 250 mA.
This source was found in Philips' 60s documentation. The transistors are from the era and the zener is 9 V. Modern transistors according to the current can be used. The output is 250 mA.