Changes

This main difference with this version of DigiBlaster is the additional Line-in connector which allows the user to feed the AY output through the card so that both sound sources get are played through the same speakers. The DigiBlaster has been made dual-mono so that both speakers play the sample as is done with the AY-3-8912 Channel B. The variable resistor RV1 adjusts the Digiblasters output level to balance it to the AY level. Unlike V1 + 2, which can be used with a passive mono speaker, the output of V3 has been brought down to Line-out levels and so should be connected to active stereo speakers.