Fast scintillation counter preamplifier for the observation of Linsley effect

A fast preamplifier circuit has been designed and thoroughly tested for the purpose of observing the air shower arrival directions including the Linsley effect. The circuit intends to eliminate the time jitter due to variation of scintillation counter signal amplitudes. It assumes that the output signals from one counter system have the same rise time. On this basis, error arising from time jitter is removed by voltage discrimination at about half signal amplitudes. Detailed description of the circuit is reported.