Building of a 4-channel TTL scaler for counting detector signals
  A scaler has been fabricated to count the signals from any radiation de- tector. It can count signals of frequency up to 140 kHz. Transistor Transistor Logic (TTL) is used in this scaler. In this article the details of the design, fabrication and operation processes of the scaler is presented. 
S. Sahu, R. P. Adak, S. Biswas, T. Mishra, D. Nag, R. N. Patra, S.   Rudra, P. K. Sahu, and S. Swain
physics.ins-det hep-ex