Some leftovers from another circuit, four bjt's: a unmatched npn-pair, a pnp and a npn an many 33kΩ resistors, I decided to design a DC and Temperature detector for protection use. No power startup included.
Diff pair is unbalanced by dc at an input, causing the greatz to switch off the pnp and hence the relays. In this configuration some 50mV is sufficient to trigger.
V34 is at the inputs, V6789 the greatz, V1011 the output.
Temp specs were hard to visualise, but act accordingly.
Shown are design and simulations, build is tucked in amp not photogenic.
Apply as required, but keep the diff pair on equal base impedance no matter what.
Diff pair is unbalanced by dc at an input, causing the greatz to switch off the pnp and hence the relays. In this configuration some 50mV is sufficient to trigger.
V34 is at the inputs, V6789 the greatz, V1011 the output.
Temp specs were hard to visualise, but act accordingly.
Shown are design and simulations, build is tucked in amp not photogenic.
Apply as required, but keep the diff pair on equal base impedance no matter what.
