We found this circuit in an old Mullard (Philips) documentation on the 555 and 556 integrated circuit (double 555). The relay must be 12 V with contacts that support the horn current.
This simple circuit of effects is interspersed between the instrument and the amplifier. It is...
January 2017 - STMicroelectronics' new TN4015H SCRs with 40 A currents and high temperature...
This circuit is for old telephones with analog lines. It was found in the May 1988 Radio...