High impedance circuit arrangement for indicating voltage in energy supply mains - has voltage tapping coupled with active part of energy supply mains and at least one indicating element also control circuit between tapping and indicating element

摘要

The control circuit has a pulse generator controlling the indicator elements (W1,W2), which contains semiconductor devices (H1;H2;H3) with a threshold value and negative resistance characteristic as well as a storage capacitor (C3). A luminescent diode is provided as the optical indicating element (W1). A piezo signal transmitter is provided as the acoustic indicating element (W2). An optical and an acoustic indicating element (W1,W2) are connected in series. A semiconductor diode (H1), pref. a symmetrical trigger diode (Diac) is provided, as a semiconductor with a threshold and negative resistance characteristic. ADVANTAGE - Facilitates feeding of indicating element without using auxiliary energy sources, from energy obtd. from input signal.