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As extensive ground-based observations and characterisation of differentvariable stars are of the utmost importance in preparing optimal inputcatalogues for space missions, our aim was to search for new variable stars inselected fields of the northern sky. We obtained 24470 CCD images and analysedphotometric time series of stars using the DAOPHOT based package Muniwin as thefirst step, and the Period04 package was used to further analyse the suspectednew variable stars. The light curves and other observational results arepresented for 3598 stars online. We found 81 new variable stars, among them isan eclipsing binary with a variable component and possibly eccentric orbitsTYC4038-693-1 which we also observed spectroscopically, four {\delta} Scuticandidates, six other variable stars with periods falling into the interval of35 minutes to 20 days. Furthermore, we identified 70 slowly varying stars withso far undefined periodicity. Additional photometric and spectral observationswere carried out for TYC 2764-1997-1, and its previous candidacy for eclipsingbinaries was approved.

Search for variable stars in the northern sky:Analysis of photometric time series for 3598 stars